I don’t think it will help you beat the market over the long run. After all, you’re competing against people who have tools at least this powerful, some of whom have a staff of analysts who do all kinds of research that you probably can’t (when was the last time you chatted with top executives of one of the companies you own shares in?) — and they don’t beat the averages over time, for the most part, either.
Still, if you own stocks, I think you’ll have a great time exploring the free tools at ValuEngine.com. Boy, have we ever come a long way from the days of people making charts on graph paper or going to the library to look something up.