This has now been applied to stock market investing by Covestor.com
Covestor is a site that allows you to track the stock portfolios and trading strategies of successful stock market investors. You can compare how your stocks perform compared to other investors and funds.
Here are the Top Ten investors on the site as of October 1st:
The above list is from Stock Trading To Go – another site worth looking at if you would like to learn more about stock trading.