Google Inc. (Nasdaq:GOOG) shares popped another 2 percent Monday after one Wall Street analyst predicted the Web-search giant's stock price could hit $500 within the next 12 months. The price target becomes the latest psychological trading barrier slapped on to the Mountain View, Calif.-based company. Google, which closed its first day of trading at $85 in August 2004, sailed past the $400 mark for the first time last Thursday.