Online Communities

CommunityWiki:
kuro5hin:
Londoncommons.net: Don't click this or you could potentially create a recursive loop which could destroy a large chunk of the internites
MeatBallWiki: A community of wiki and online community developers sharing ideas about the workings of online communities.
SlashDot:
ubuntuforums.org: All the info and help you could imaging for the ubuntu distribution of GNU/linux