I do something like this with real stocks and at a virtual stock site. It's a ton of fun if your an economics geek.
I signed up and invested in one of my trusty old stocks. Short-term gains are mostly luck, though. I'll join the group and see how it goes. It's a good day to start trading, I guess.
That's a good investment. Google had a HUGE gain this summer that has already been obliterated by the recent crisis. With Chrome out and the google phone making lots of hype, it's only a matter of time before those losses are made up.