As Google returns to $500, bulls are calling for more

It's been more than a year since Google (GOOG) shares traded at $500, but it looks like Googlemania has officially returned. The search giant's stock price crossed that symbolic threshold on Tuesday and danced around the $500 mark before closing at $499.06, up half a percent. That put Google shares up 62 percent in 2009. And it means Google founders Larry Page and Sergey Brin -- each worth about $14.5 billion -- have seen their paper fortunes leap by $6 billion in 2009.

Is there more to come? On CNBC Tuesday, Mad Money's Jim Cramer said he expects Google to hit $600 next year. Urging investors to buy the stock, the former Goldman Sachs trader and TheStreet.com founder (who who has appeared on his show wearing a straightjacket) declared Google is "too cheap."