Twitter is nothing short of a phenomenon. At the very least, it connects people to each other through a rich and active exchange of ideas, thoughts, observations, and vision in one, highly conducive ecosystem (known as the Twitterverse). The social fibers that weave together this unique micromedia network is strengthened by the expertise, respect, trust, admiration, and commonalities. These fabrics bind the people who breathe life and personality into the global community as well as fueling the disparate micro communities that ultimately extend across the Long Tail.

Of all of the social tools and services that are pervasive throughout our digital society, only a select few communities can boast the pseudo fanatical conviction that Twitter‘s users unanimously possess.

Twitter is quickly gaining momentum, support and market inertia and is on direct path to mainstream awareness. Compete.com numbers show that roughly 2.5 million people visit Twitter.com each month, growing at about 250,000 – 500,000 users per month and up over 440% since this time last year. Just as a comparison Facebook receives about 41 million unique visitors per month.

Twitter is not only embraced and cherished by the people who rely on it for expression, insight, news, and communication, it is also the darling of the developer community. Almost every single day, a passionate developer, b2b or b2c application company, or tech enthusiast will develop a new tool, service, or solution to make Twitter a more personalized, professional, streamlined, effective, and/or fun experience.

If you live in the world of socialized marketing, communications, relationships, communities, research, service, digital anthropology, fundraising, publicity, product development, publishing, events, online reputation management (ORM) or simply seeking to increase your proficiency and efficiency on Twitter, there is surely no shortage of tools and applications that can help you.

I created this snapshot guide to help you extend the reach and the efficacy of Twitter for your personal brand as well as the brand you represent. This is the first part of a multi-part series. If you’d like me to review and include additional tools and services, please share them in the comments and I’ll integrate into the next rev.

As of March 2009, here are the top 10 apps for Twitter (Source, TweetStats):

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TWITTER TRENDS AND ANALYSIS

SocialToo is offers a suite of productivity solutions for Twitter, identi.ca, and Facebook. It’s most notable and unique feature is SocialSurverys, providing the ability to create elegant polls that can be shared across multiple networks (provides for automatic distribution through Twitter) and tracked in one central location for analysis. The service also offers a host of other social management tools such as Auto-Follow, Auto-UnFollow, Blacklisting, Direct Message to New Followers, Daily Stats via email.

Twitt(url)y is a service for tracking popular URLs people are sharing on Twitter as a way to identify trends, topics, and new and interesting tools and services. It’s basically Techmeme or Google News for Twitter, but for all popular links shared in a given day.

Retweetist is a community that showcases the most “retweeted” people, URLs, and also those who actively “RT” others – otherwise known as the retweetists. The service is extremely helpful as it leverages the wisdom of the community to curate content for your consumption. As a marketing professional it also spotlights the most retweeted users and those who RT them when you need to identify a micro network bound by topic or keyword.

TweetStats is a hub for Twitter trends and analysis. For instance, you can analyze your tweets and those of any username by hour, month, and timeline to determine a pattern of activity. Reply statistics and topic clouds also paint a picture of influence and key themes that portray interests. TweetStats is also a dashboard for observing current, emerging, and all time Twitter trends in real time.

MicroPlaza is a personalized meme tracker that tracks and aggregates the common links shared on Twitter by your friends en masse or by creating specific groups (tribes).

Favrd (pronounced Favored) is a service that channels the most “favorited” tweets on Twitter. You can search by keyword and also see who else has favorited a particular tweet in order to identify like-minded contacts.

TwitLinks aggregates the latest links from the worlds top tech twitter users.

Tweetmeme tracks the top memes aka threads aka discussion on Twitter based on the lin
ks people share.

Twist analyzes and presents trend comparisons and volume between keywords and tags.

TweetPad provides a visual representation of Twitter feeds and statistics with dynamic typography. You need to read the “about” section in order to get a real feel for its capabilities.

Plodt plots your professional or personal life, interests, activities, and moods on Twitter. Basically you can categorize your Tweets so that you can analyze them as an individual as well as compared to the community at large.

Twitscoop is a trendcasting service that aggregates the top topics on Twitter and presents them in a visually rich tag cloud. You can hover over each cloud to see a pop-up overview of the discussions around the topic or click through to dive deeper into the analytics of the conversation volume and duration and also participate directly. TwitScoop provides the ability to search keywords and usernames to analyze the dialogue and frequency behind them.

TwitterCounter provides an interactive chart that chronicles the quantity of Twitter followers for any given username. The results are viewable by week, month, and quarter and the service will also predict the future volume of followers based on the average growth/loss over time. The chart is embeddable as a widget on any profile, blog, or Web site.

TwitterFriends is one of the most compelling analytical tools for identifying relevant conversationalists, revealing conversation patterns, and visualizing material conversation networks, by Twitter ID. The services aims to map the “relevant net” for any given user, which is incredibly valuable to any communications or service professional identifying influential voices and associated social graphs. For example, stats list to whom you (or any username) reply most often and those who reply back. The system determines a Conversation Quotient (CQ) that attaches a metric to the volume of tweets that include @ replies. For reference, the average CQ is 25.4%. The reports also provide the size of the relevant net (those you reply to or receive replies more than once in the last 30 days) outgoing and incoming, number of fans, loyalty, Twitter Rank, ratio of outgoing/incoming contacts, the follow cost, the conversational rank (number of public conversations with users), number of replies, a Retweet Quotient, Link Quotient, among many others. Perhaps most intersting, is the visualization of the TwitGraph which displays the rank of any user across multiple axes, Twitter Rank, CQ, LQ, RQ, Follow Cost, Fans, @replies.

SocialWhoIs is to Twitter and FriendFeed what “Who Is” is to Web sites and IP addresses. It reveals who you should follow and why – based on relevance and not popularity. SocialWhoIs gives you a snapshot of any given user name with links to their assumed social network profiles, related keyworks/topics, as well as a “home base” link. You can also search tags to identify individuals worth following and potentially engaging.

COMMUNICATION SOLUTIONS

TweetDeck is a must for any community manager, marketer or researcher tracking important and relevant conversations on Twitter. It’s an Adobe Air desktop application that enables users to split their main feed (All Tweets) into topic or group specific columns allowing the tracking of a broader overview of tweets based on keywords or groups of people.

PeopleBrowsr, an attention-centered dashboard for managing your online relationships and communication in Twitter and across multiple social networks. At its foundation, PeopleBrowsr is a first of a kind meta-network for social networks that works with Mozilla FireFox 3, Safari 3.1 or Google Chrome – no download or plug-in required. It essentially turns your Web browser into a simple, visual social media dashboard. While there are many third-party tools for Twitter, PeopleBrowsr brings the best features from all of the popular add-on services into one solution – without requiring a download or a browser plug-in. More on PR 2.0.

CoTweet is a platform that helps companies listen to and communicate with customers and influencers on Twitter. Like Splitweet, businesses can manage multiple accounts in one dashboard. In addition to PeopleBrowsr, CoTweet is perhaps among the first dedicated Social CRM solutions designed specifically for businesses. It allows for multiple simultaneous users to monitor conversations related to the brand, assign action to other treammates on the community management team, schedule messages, and reply from different accounts – all from one window.

Splitweet is a multi-account management dashboard for corporate users and brand managers. Designed for power users, it provides seamless management, monitoring and communicating across several twitter accounts simultaneously – all from one place.

Power Twitter is a powerful plug-in for FireFox that moves many disparate services and capabilities into one central location – right in your browser. This is almost a complete Twitter experience for the general and even power use, one that Twitter itself should provide. First, Power Twitter provides an at-a-glance Twitter history view for every person in your timeline. Second, search functionality is built in, so that keywords and hashtags are immediately viewable without opening a seperate window. And, @replies functions as it should. It reveals not only those tweets that begin with @yourusername, but now also include every tweet with @yourusername, regardless of where it’s positioning in the message. Similar to TweetTree, content linked to in sites such as Flickr, YouTube, and TwitPic appear in the timeline – again saving you time from having to jump outside of Twitter. Overall, Power Twitter is a seamless experience. Install it, hit Twitter.com as you normally would, and you’ll notice the new and improved capabilities.

Gridjit is a social portal that lets you view your web universe in a more visually rich way. It becomes your hub for tracking conversations, interesting people and those they @ frequently, and also provides a central location to post and share.

Monitter is a dashboard for searching up to three keywords on Twitter and reviewing the results in three distinct columns. The search can be further honed by proximity to any particular location. The results are not only ideal for listening, but also displaying them for the community to read and enjoy. Brand managers can download a widget to automatically view the community discussion or present it on a corporate blog or Website. Individual searches are also available as RSS feeds for monitoring through the feed reader of your choice.

TweetGrid is also a listening dashboard for Twitter. It offers community managers and communications professionals the ability to simultaneously monitor keywords, brands, competitors, executives, etc. all within one window.

GroupTweet is similar to Yammer, except it’s within Twitter. Workgroups, extended networks, communities, and anyone who wants to broadcast and share private tweets to a specific group can do so for free using this unique and helpful service.

Tweet Later allows you to schedule tweets for a particular time and day. It also allows you to auto-follow those who follow your account and provides an auto-welcome feature to send a custom message to new followers via DM or in the public timeline.

Tweetbeep is the Google Alerts for Twitter and is a “listener’s” dream service. It allows you to monitor conversations that mention you, your brand, related or competitive products, as well as links to your website or blog, even if they use a shortened URL, such as tinyurl.com. You’re alerted as your keywords appear, reducing the need to manualy search for them.

Twilert is also an “alert” for Twitter that monitors Twitter for your keywords and sends them to you via email on a daily, weekly, or monthly basis. Having these emails trip as keywords appear would be ideal for any brand manager.

TwitterFeed connects your blog to Twitter and automatically feeds posts into the timeline with each new update.

Twiffid shows the headlines of the Websites your Twitter friends have listed in their profiles to see what they’re linking to or blogging about.

TwitThis is really a potentially powerful and game-changing service, if it gets traction. If you’ve ever visited a site or blog and have seen or used the “share this” or “email this” feature, TwitThis is similar in concept. Essentially, it grabs the url of the page you’re on, compacts it into a TinyURL, and then allows you to add some thoughts to directly post to Twitter from the page you’re visiting.

Diigo.com offers one of the most feature-rich and robust social bookmarking / web annotation services on the web today. Via Diigo’s “Twitter-this” feature, you can easily share interesting websites or content on Twitter with a shortened URL – from the page you’re visiting. It also allows you to easily add highlights and sticky notes to any webpage, and then share the annotated page with your Twitter followers. They will just see an ordinary link in the twitter message; but when click the link, they can also see your highlights and sticky notes right on the page.

Tweetree is a new service that attempts to thread related conversations in Twitter. Considered an alternative for those who read and post updates through Twitter.com, Tweetree also allows people to share content directly in the timeline. By simply including a link from YouTube, Flickr, TwitPic, FriendFeed, Seesmic, Qik, Lala, or Blip.fm, Tweetree embeds the content inline for others to enjoy without leaving the service.

OutTwit might just be the tool that bridges Twitter to the enterprise. More people use Outlook in business than any other email client. Now you can update Twitter and tap into the stream directly from Outlook. If you’re a brand ma
nager, community manager, or communications professional, you can establish search criteria for keywords and channel the results into dedicated folders in Outlook. You can also categorize and archive tweets through a seamless folder creation and storing option.

TwitterMail allows you to update Twitter via email. Once you log in, the system provide you with a dedicated email account, such as yourusername@twittermail.com. When you send an email to that address, it will automatically post a tweet for you. The service also sends email directly to you as you receive @ replies, which is ideal for brand and community managers. TwitterMail provides the ability to read your timeline in email by addressing a message with “friends” in the subject line. The service will send the last 20 updates immediately. If 140 characters won’t work for your individual tweets, type the full context of what you’d like to share and TwitterMail will link the tweet back to the full posting for all to enjoy. And, through TwitterMail you can schedule tweets for publishing at a later date/time.

TWPLY is new service that tracks personal @replies and sends them to your designated email inbox. Seems simple enough and may be ideal for those high volume personal and corporate brands that need to actively monitor inbound tweets without having to stay connected directly to Twitter, Twitter Search, or a third-party service.

TWPLY is highly regarded as a spam app and raises questions as to the value of the service overall. On the heels of its rise and fall, we learn about Replies by Twitapps, a more elegant solution for receiving @replies on Twitter in your inbox. It delivers your updates on an hourly basis or when your replies reach a threshold of 25 tweets (whichever is first). Again, this is ideal for any brand manager, community manager, or communications professional, tracking important usernames on Twitter.

EasyTweets is a solution for pre-scheduling tweets. Brand managers and customer service and communications professionals can also manage multiple Twitter accounts, check replies, and track new followers from one central hub.

RELATIONSHIP MANAGEMENT

Whoshouldifollow.com makes it easy to find relevant, like-minded friends as well as friends of friends based on keyword and validated networks.

Twubble can help expand your Twitter network. It searches your friend graph and introduces and recommends new people who you may want to follow.

Twellow, a service of WebProNews, is an exceptional service for finding people who matter to your business or industry, by category. You can search keywords or browser through common categories to find the voices you deem as worthy following and/or connecting with on Twitter or other social networks. You can also claim your Twitter ID to further customize your individual profile with a short bio, extended bio, links to other profiles popular social networks such Facebook, LinkedIn, Delicious, Flickr, FriendFeed, etc.

Twitter Karma is an interesting and also very useful tool for visually identifying those whom you follow, who do or do not follow you, and the relationships that are mutual. In one dashboard, you can determine whom you should also follow as a token of reciprocity or a simple matter of missing an important new follower/s and also whom you can contact to also return the favor. It also makes it simple to individually check those to follow or unfollow and also provides the ability to bulk follow, unfollow and block.

Like Twitter Karma, FriendOrFollow provides a simple and quick solution to find out who you’re following that’s not following you and who’s following you that you’re not following back.

TweetWheel visually presents your social graph, who’s following you and who you are in turn following. It is a helpful solution for identifying who you may or may not need to follow, as well as view the friends you share in common.

Even though Twitter features a directory search engine by name and email address, TwitDir always seem to find everyone, even when Twitter misses a contact. I use TwitDir when I’m looking to discover whether a particular contact or someone I’m trying to connect with is using twitter. Alternatively, you can use Google or Yahoo search and type “PERSON NAME” (in quotes) and the word twitter (outside of the quotes) in the search box to find the username. See example.

Tweet Pro is a paid service that allows you to create a solid network based on keywords and interests. The software allows you to locate specific Twitter users to enable mass, but focused following to generate a highly targeted account for your business/brand.

DoesFollow is as simple as that. If you want to know if USERNAME follows USERNAME quickly and easily, this is your
service.

Tweet 2 Tweet

Tweet2Tweet provides you with the ability to view a history @replies between to Twitter users, which can be helpful for learning and understanding perspective and context.

Follow Cost estimates the potential attention (or annoyance) cost of following a particular individual or account. Here’s the result for @briansolis.

Qwitter will send an email to you when someone unfollows you and will link the action to the most recent tweet that you posted. Through a series of experimental tweets, Qwitter is a humbling and instantaneous solution for honing your updates to better match what your friends and followers hope to see or not see.

Twitter Twerp Scan

Twerp Scan checks the number of followers of everyone on your contact list, the number of people they are following, and the ratio between those. If the person is following more than (n) people (can be customized), and has a Following-to-Followers ratio higher than 1:(m) (can be customized), you’ll be notified by a link. Even if you have no use for that, you might find Twerp Scan a helpfultool for keeping an eye on your growing list of friends and followers.

TweepSearch is the first search engine that allows anyone to search and discover relevant Twitter bios and location information using keywords. It’s ideal for learning more about those following any given username as well. For example, type @username and you can puruse through individual followers of @username and their corresponding Twitter bios.

Headup is a semantic desktop app that boosts and connects the social Web experience. When applied to Twitter, it places a Headup underline/icon next to user names, which when clicked, allows you to dive deeper into their online profile. Headup scours the Web and prepares an instant directory of social profiles and links to their persona and other online activity. Download Headup here.

Mr. Tweet is your personal networking assistant on Twitter. It helps you easily build meaningful relationships by looking through your network and tweets. Mr. Tweet will then suggest new and relevant tweeps and existing followers you should also follow. “He” also provides usage statistics that help you improve your engagement level on Twitter.

TwitterSnooze is a very welcome solution. There are many people that I follow whose tweets I usually enjoy reading. However, sometimes, those tweets can be obscure, irrelevant, loud, or unnecessarily narcissistic. Or, every now and then, a good friend will attend a conference, session, event or workshop that I don’t care to endure virtually. TwitterSnooze provides the ability to “snooze” certain friends for a pre-determined period of time. If you’re daring, you can also publicly tweet that you’re snoozing someone.

Twalala

Twalala adds a mute button to Twitter allowing you to focus your stream as necessary without completely unfollowing someone.

Developed by Brooks Bennet, TweetChat is a service that introduces the ability to focus on specific conversations or topics. Using a “room” metaphor, users simply type in a hashtag (#name or #id) or a keyword related to brand, news, topic, etc., to specifically identify and channel all tweets related to that conversation. You can read and respond directly from TweetChat.com, but requires login using your Twitter ID and password.

My Tweeple is a Twitter follower/following manager that provides a one-stop dashboard for who you’re following and who, in turn, is following you. The service allows you, with a single click, to follow, unfollow, or blog people (or tweeple).

Also see TwitterLocal below…

TWITTER SEARCH

Before Summize, now the official Twitter Search engine, Twemes and #hashtags provided the ability to index conversations based on keywords, groups, topics or tags also known as #hashtags. These Twitter memes can now be followed outside of the public timeline through a focused and dedicated stream.

Tweet Scan, like Summize (Twitter Search), is a search engine for Twitter. Both services provide the ability
to search keywords, company/product/competitors names, users, etc. The services also feature the hottest search trends at that particular moment. I have noticed that in some cases, one or the other, consistently provides results that the other missed. Note, by clicking “Replies” in Twitter, you’re only seeing tweets that start with @yourname. These search engines also track users as well as important and relevant keywords – as they appear.

PUBLIC RELATIONS

@MicroPR is the brainchild of Stowe Boyd and Brian Solis (with the help of Chris Peri.) It connects journalists, bloggers, analysts, and other influencers to PR. If you’re in PR, communications, blogger relations, community management, analyst relations, make sure to follow @microPR on Twitter. If you are a journalist, reporter, blogger, analyst, or anyone looking for the help of someone in PR, tweet @microPR with your request, and PR people will see the rebroadcast through the micropr account with your Twitter name.

TWITTER INFLUENCE AND RESONANCE

twInfluence allows you to measure Twitter influencers, not just by followers, but also by reach, velocity, social capital and centralization. It also publicly ranks the top 50 influencers in each category. This is an important tool for identifying the tastemakers that you don’t already know in the Twitterverse.

Twitority is a new service that that facilitates the search and sorting of keywords in Twitter by authority, or in less controversial terms, popularity. At the moment, authority is measured by followers, but perhaps, Twitority will eventually create an algorithm similar to Twinfluence in order to more accurately measure influence. Twitority is a simple, yet helpful service that will help brand managers, community managers, and communications and customer service professionals tier research and response strategies and programs. It’s also helpful to identify and measure potential opportunities and new trends based on the weighted discussions surrounding relevant topics. Searches can be sorted by any, little, or more authority.

xefer

xefer reviews your Twitter account and presents a rich visual analysis of your tweet volume, concentration as well as their resonance (measured by replies) by day, time, week and hour. Here are the results for @briansolis.

TwitterGrader measures the relative power and authority of a Twitter user by calculating the number of followers, the power of the network of followers, the pace of updates and the completeness of a user’s profile. Here’s the result for @briansolis

Retweetrank documents topical influence and audience interest. It measures the RT reach and frequency of anyone on Twitter by calculating the number of RT’s associated with a username. It then ranks the results based on the quantity of retweets and also provides an approximate perctentile representation of the rank as it compares to the general Twittersphere.

TWITTER MARKETING/ADVERTISING

Twittertise allows you to advertise on Twitter and track the success of branded communications with your customers. As a social marketer, you may also enjoy the ability to schedule and measure your communications on Twitter. The platform provides URL tracking technology to measure the effectiveness of your traffic driving ability on the platform.

Twittad is a micro ad network that connects advertisers to Twitter users to create opportunities for paid product placement and website promotion directly on a Twitter user profile (usually as a background image.

Magpie is an ad network for Twitter. It connects advertisers to related tastemakers/beacons on Twitter by keywords. The cost per ad is derived from the ratio of followers to the hotness of a particular topic. Then the ads are intermidently injected into an indivudals stream, according to the site, at one ad per five tweets.

Whatsyourtweetworth.com analyzes your account and network to recommend what your tweets might be worth through Twittad.

TWITTER STREAM MANAGEMENT

Twitterrific is an elegant and “lite” software application that lets you read and publish tweets from
the desktop, iPhone and iPod Touch.

Recently acquired by Seesmic, Twhirl is a social desktop dashboard that centrally manages activity, messaging, and updating for Twitter, FriendFeed, Identi.ca, and Seesmic. It is an Adobe Air application, which is a very thin desktop client, but still requires a download.

TwitterFox is a Firefox extension for Twitter. This extension adds a tiny icon on the status bar which notifies you when your friends update their tweets. Also it has a small text input field to update your tweets.

iTweet is similar to twhirl except that it’s an online dashboard that focuses specifically on Twitter. In many cases it’s what Twitter.com should be, as it is a centralized hub for managing your twitter communication, relationships and also learning more about the people you find intriguing. For example, you can click on a profile picture to instantly learn more about someone without leaving the stream. You can also RT, DM, favorite, reply, or delve deeper into their profile direclty from the timeline.

Ping.fm is a central distribution service for sending updates to multiple social networks, including Twitter, with one click. Supported services include Plurk, Identi.ca, Facebook, Pownce, LinkedIn, Tumblr, Brightkite, Jaiku, hi5, Kwippy, among other. Note of caution, broadcasting updates doesn’t replace the need to participate in each community that you wish to build and maintain valuable individual relationships.

Have multiple accounts on Twitter? Matt (Multiple Account Twitter Tweeting) provides a platform for broadcasting one update to multiple accounts. This is ideal for companies with a series of representative brands and employees that need to send orchestrated, general updates across all accounts simultaneously.

Feedalizr is an Adobe Air app that serves as a dashboard and an update center for Twitter, FriendFeed, Flickr, Pownce, and Facebook. If you’re managing multiple social accounts, Feedalizr provides a desktop-based hub for listening, sharing, filtering, researching trends specific to conversations within each network, and posting content to specific communities.

Hellotxt provides the ability to instantly update status as well as view the status of your contacts across multiple networks (Facebook, LinkedIn, hi5, Plaxo, Pownce, Plurk, FriendFeed, Identi.ca, BrightKites, etc.) – all from one dashboard.

FeedTweeter connects social services that offer RSS feeds to you Twitter account. For example, you can have your updates at Plurk, Flickr, Identi.ca, YouTube, Delicious, etc., feed Twitter with updates as they happen.

TwitterKeys

TwitterKeys enhances Twitter conversations by replacing words with UTF8 compatible images – thus saving precious character space.

GEOLOCATION + IMAGING

BrightKite is a location-based social network that connects directly to Twitter. You can share your location and also locate friends geographically from the Web or your mobile phone. The service also offers an easy and direct channel for uploading pictures and notes to BrightKite and also Twitter – perfect for those with camera phones!

Loopt is “perfecting the art of connecting people and places.” In essence, it’s an elegant location-based social network + compass designed for connecting you to other people and destinations via mobile phones. Loopt recently introduced the ability to share updates and location via Twitter to also extend the reach and allure of connecting with and discovering people, and also places, not yet participating in the Loopt network.

TwitterLocal is the ideal service for quickly finding active voices within a specific city, state, postal code as well as the vicinity, ranging from 1 mile to 20. Not only can you search those voices, you can instantly produce an RSS feed for each search criteria to monitor localized conversations through your feed reader. Here’s an example of the results for a search within 1 mile of San Francisco.

Twitpic provides a bridge from your camera phone to Twitter. Pictures can either post to the Twitter public timeline from phone via email or through the site.

SnapTweet links your flickr account to share updates seamlessly to Twitter.

EVENT MANAGEMENT

Twitzu is an event invitation management service for Twitter. You can create an event, broadcast it to followings and manage RSVPs.

CONFERENCE – LIVE TWEETING

LiveTwitting is a streamlined solution for livetweeting (covering) conferences. Today, people typically live tweet events in a rapid fire, spur of the moment style, creating a broken, but still somewhate effective flow. LiveTwitting provides an efficient and elegant solution to record, edit and repurpose the stream, and mark topics, segments, and speakers.

TWITTER MOBILE APPLICATIONS

Twittelator is a Twitter client for the iPhone. You can manage multiple user accounts, update your accounts, share pictures, a map of your current location, connect with other Tweeps, read tweets from your contacts, and direct message (DM), and reply all from one app.

Hahlo is a sophisticated Safari-based, fully-functional Twitter solution for the iPhone. Not only can you tweet and follow tweets in your timeline, but you can also search, find out who’s near you, send/view DMs, see who you’re following, who’s following you, your archive, etc. It actually is integrated and more useful than the capabilities available at Twitter.com.

Twitterfon is a fast, simple Twitter client for the iPhone and iPod Touch. It is focused on 80% of your tasks in Twitter such as viewing friends/replies/messages in the timeline and also sending/replying tweets.

Twinkle is a location-aware network for the iPhone and iPod Touch that helps you discover, connect, and send messages to the public timeline and also to people nearby. You can share photos and update your Twitter account from the phone.

Twitterberry

Twitterberry is a full-featured Twitter client to read and post updates from BlackBerry phones.

More to come…