Bitcoin Wiki:Community portal

Bitcoin Community Forums

• Official Forum
• BitcoinMe Forum
• Bitcoin google group
• Bitcoin.in forum (SMF)

IRC Chat

• General Bitcoin-related (webchat)
• Development and technical discussion (webchat)
• Over The Counter exchange (webchat)
• Live streaming quotes from MtGox and BCM (webchat)
• Live auctions (webchat)
• GPU mining related (webchat)
• RSS News related to Bitcoin (webchat)

There also are IRC channels for for-profit initiatives such as Bitcoind Investment Club and Witcoin.

Wiki Users

• List of Users registered on the Bitcoin wiki.

Events

• [Meetup|Tokyo Meetup]
• New York Bitcoin Users Meetup Group
• Washington, DC Bitcoin Users Group

Bitcoin Related Blogs

See Blogs category.

Maps

• The Bitcoin Map collaborative map

Bitcoin Project

• Bitcoin.org Official project site
• FiveGrinder.com Project planning and Activism
• Developer pages