I found this interesting article discussing the possible shape and function of a market for trading shares in professional athletes. It was really quite interesting, and seemed logical. I have a few friends who I know would be interested in trading on that market, after all, they talk about the stock market all the time and they love sports.
There is already a market in the early stages of development. More of a fantasy sports site at the moment, it is still quite interesting. You can check it out at ProTrade.com

