Lifestreams are back in the spotlight again thanks to the most recent meme started by Steve Rubel, except this time, the popularity of flow, aka presence applications, such as Twitter, Pownce, Jaiku, and Tumblr is much greater and expansive than the last time the topic circulated the blogosphere. As the idea starts to move along the bell curve, people are realizing the potential for aggregating information and broadcasting a focused channel of relevant content – on both sides of the…