Forums in Finance

1. Trade2Win
The #1 active trading community in UK shares, US stocks, index futures, options, commodities and forex. 250K+ members and 1.6M+ posts since 2001.
http://www.trade2win.com/boards/  

2. Money Talk
http://www.money-talk.org/board.html  

3. Elite Trader
Elite Trader is the #1 site for traders of stocks, options, currencies, index futures, and cryptocurrencies.
http://elitetrader.com/vb/  

4. Canadian Money Forum
A forum community dedicated to Canadian personal finance enthusiasts. Come join the discussion about investing, stock portfolios, equities, frugality, real estate, market trading, taxation,...
http://www.canadianmoneyforum.com/  

5. The Fastlane Forum: Entreprene
The Fastlane Forum: Startup and Entrepreneurial Business Discussion and Forum. Based upon the book, The Millionaire Fastlane by MJ DeMarco
http://www.thefastlaneforum.com/forum.php  

6. Payment Processing Forums & Cr
Payment Processing Forums & Credit Card Fraud Discussion Board
http://www.paymentprocessing.cc/  

7. ETF Talk
ETF Talk
http://www.etftalk.com/  

8. Stool Pigeons Wire Message Board
Forum has 891,101 posts.
https://www.capitalstool.com/forums/  

9. Chargeback
Forum dedicated to chargeback protection
http://www.chargebackforum.com/  

10. PeercoinTalk: Official forums
PeercoinTalk: Official forums for help, advice and news about Peercoin (PPC) and Primecoin (XPM)
http://www.peercointalk.org/  

11. Forums
Yet Another Forum.net, Forum, ASP.NET, BB, Bulletin Board, opensource
http://moneyforums.citywire.co.uk/