Forums
General Bitcoin Discussion
- BitcoinTalk Forum (formerly located at Bitcoin.org)
- Bitcoin Subreddit
- BitcoinForums.net
- Bitcoin TweetForum
- Bitcoin-Board Forum
- Bitcoin google group
- Bitcoin.org.uk Forum
- Bitcoin Australia Forum
- Bitcoin Trading Forum
Language Specific
Other
- MtGox Live Traders Forum
- Bitcoin StackExchange - Q&A site, currently in public beta
- Developer mailing list