Agoracom
Investor relations site for small cap companies. Features monitored discussion forums for CEO's to communicate with shareholders.
http://www.agoracom.com/

Allstocks.com
Live stock market chat using a java applet.
http://www.allstocks.com/livestockchat/livestockchat1/LiveStockChat.html

ASX Ozzystox
Moderated forum for investors in Australian stocks.
http://groups.yahoo.com/group/Ozzystox

CANSLIM
Discussion board for the CANSLIM stock screening method described by William O'Neil in "How to Make Money In Stocks."
http://www.xmission.com/~mcjathan/canslim/canslim.htm

The Critical Mass Discussion Forums
The Hedgehog's stock boards. Featuring informed discussion of high tech, internet, small cap, and penny stocks.
http://hedge-hog.com/bbs/

FinanceBB
Forum discussing UK and US stocks. Formated for fast access and easy reading. Free to use but all registrations manually checked to ensure quality of contributors.
http://www.financebb.com/

IncredibleCharts Chart Forum
Discussion forum with stock market charting and trading strategies.
http://www.incrediblecharts.com/forums/messages/board-topics.html

Silicon Investor
Stock discussion site.
http://www.siliconinvestor.com

StockHouse Media Corp.
Portfolio tracking, BullBoards forums, and newsletter aggregation as well as detailed snapshots of all securities traded in North America.
http://www.stockhouse.com/

Stocks Discussion Forum (About.com )
Discussion threads for individual stocks, IPOs, the markets, and general investment topics.
http://stocks.about.com/mpboards.htm

Stocktraders-ICQ
Experienced day traders and positional traders communicate during market hours via icq.
http://stocktraders-icq.tripod.com

Superiorinvestor.net
Community for the discussion of stocks and the stock market.
http://www.superiorinvestor.net/

TalkStox
US and Canadian stock market related discussion forums, message boards and general stock talk.
http://www.talkstox.com

Traderji.com
Indian stock market forum for traders and investors.
http://traderji.com/