Bitcoin Wiki:Community portal

Bitcoin Community Forums

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

IRC Chat

• General Bitcoin-related (webchat)
• Development and technical discussion (webchat) (archive)
• Over The Counter (OTC) exchange (webchat)
• Trading Pit (webchat) "Business only" trading pit
• Live streaming quotes from MtGox and BCM (webchat)
• Live auctions (webchat)
• GPU mining related (webchat)
• RSS News related to Bitcoin (webchat)
• Marketing and promotion of Bitcoin (webchat)
• Bitcoin users in Australia (webchat)
• Unofficial Bitcoin Wiki Project (webchat)

There also are IRC channels for for-profit initiatives such as Witcoin and XKCD Pool.

Wiki Users

• List of Users registered on the Bitcoin wiki.

Events

• Meetups
• Events, conferences and other events

Bitcoin Related Publications

• Bitcoin Weekly weekly newspaper by User:Kiba
• The Bitcoin Sun weekly newspaper
• See Blogs category
• See Press

Maps

• Bitcoin.local Local exchanges
• The Bitcoin Map collaborative map
• Bitcoin Users Worldwide - Find nearby Bitcoin users • Engage in local trade • Add your own offers • Get notifications

Monitoring

• Bitcoin Charts displays an overview of Bitcoin exchange markets.
• The Bitcoin Monitor visualizes transactions, new blocks and trades on markets as they are happening.
• Bitcoin Watch has various statistics on things like the size of the economy or the number of transactions.

Bitcoin Project

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

External Communities

• Bitcoin Group on Steam platform by Valve