There's a thing on the BBC web site called Celebdaq where you are given �10,000 in virtual money. With this money, you buy shares in celebrities.
As celebrities are given media coverage, their share value goes up and/or down and the idea is you trade these shares, trying to predict which celebrities will b most profitable (for example, you may guess that Sir Alex Ferguson will get a lot of coverage over the weekend, so you'd buy shares in him on Friday and hope he makes it to the sports pages).
It's worth a laugh, so give it a try. It's free to register, and if you register fully (also free), you could win �100!