While stock forums may be the best way to consistently share information, online chat rooms are becoming the best way to discuss trading live, as it happens, with other traders. These are the best chat rooms out there:

IBCRadio.com - Accompanying their "Stock Talk Live" radio show, this set of regulars are available every trading day to discuss the micro-cap world.

ActiveTrader.com Chat - Chat in a variety of topics available, but a download is required.

AllStocks.com Chat Channels - A variety of channels for those experience with IRC.