Well, naturally, if there was a winning trading system, the owners/inventors of it would do everything they could to keep it secret. If everyone did the same thing, the power of the system would be diminished.
Conversely, you can assume that any system you see for sale in trading/investment magazines or sites couldn't really work, otherwise they wouldn't be for sale.
Read this article by Richard Russell. He's the best market observer I know of [url]http://www.dowtheoryletters.com/DTLOL.nsf/htmlmedia/body_rich_man__poor_man.html[/url]
I subscribe to his newsletter and the two fundamental things that he has seen work to make money in the markets is compounding interest, and being on the right side of the stock market's primary trend. He's a real big-picture thinker, but when he sees short term opportunities and reversals, he'll point those out as well.
[url]www.dowtheoryletters.com[/url] I cant recommend Russell highly enough.