For 'strategies' you will need to go to specific software product sites such as TradeStation, Wealth-Lab, eSignal, AmiBroker etc. But I think you need to subscribe to their products before you can get on their bulletin boards - and of course you would need a good understanding of their products/languages to understand what their strategies mean.
Metatrader forum http://www.strategybuilderfx.com/forums/index.php? Tradestation forum https://www.tradestation.com/discussions/Main.aspx Metatrader MQL scripting language is 90% similar to Tradestation easylanguage, with wealth-lab script just 50% similar to other two and harder to learn. I was amazed with knowledge level traders in these forum as opposed to ET which become a chit chat place only. Lets say when they talk about scalping strategies, everything is clearly defined, like what criteria for setup, entry, re-entry, scale out, trail, exit all with given inputs, filters and additional parameters for functions to adapt to market condition like volatility, ATR, parabolic sars... each system posted along with performance summery I found traders in Esignal forum less knowledgeable than tradestation and Metatrader. Wealth-lab I believe should have many good topics, but it is very hard to search the forums because there is no option to search the threads by Number of views, replies, #votes, etc. This is what i mean http://www.wealth-lab.com/cgi-bin/WealthLab.DLL/search
http://www.smotass.net/bookmark.html Lots of links. You can get stock stuff by clicking on the revolving horse at the top of the page and then click on "stocks".
www.einvesting.com www.e-minitraders.com/CCIBoard/ www.emini.deltat1.com/forum/ www.futuresmag.com/forum/ www.learncurrencytrading.com/fxforum/ www.juniorstocks.com www.khalsaspad.com www.tacticaltrader.com www.talkstox.com/forum/ www.trade2win.com www.turtletradingsoftware.com/forum/ Took these off my favorites list. Don't know how many are active.