For those who are able to use their computers at work without fear, you can go join the Macquarie Warrant Hotshot 2010. I took part in it last year, and through sheer luck, won some cash prizes.
I have joined the contest again this year but so far, there is not much volatility compared to a year ago, that would help make me massive gains through sheer swings.
Anyway, I think the game/simulation is a very useful tool for education. Apart from Forex, this is the only other time you get a "feel" of the market. Furthermore, with a prize incentive, it sometimes feel like betting your won money. Ha.