Search leader, and start-up gobbler, Google (NASDAQ: GOOG) surpassed the $500 mark for the first time today. This is a significant milestone which only took a little over two years to achieve – making its initial public offering of $85 per share seem like a bargain today. And, if you think about it, it really has been a meteoric rise for the pair of Stanford University graduate students, Larry Page and Sergey Brin, to go from a garage to a…