A while ago I wrote an article on predictive markets based on a news story on Yahoo News. In a recent IEEE Spectrum Magazine , there was a more detailed article on the subject [1]. The article has a few more examples of prediction markets used at companies. The article also has links to several online examples of prediction markets.
[1] Cherry, Steven. September 2007. "Bet on It! Can a Stock Market of Ideas Help Companies Predict the Future?" IEEE Spectrum. Vol. 44, No. 9.