These are a small collection of links that are relevant to the hacking community.
Binary Revolution - Community ran by the DigitalDawg Pound.
SoldierX - Long standing group with a large community.
Area51 Archives - Hacking documentation project.
Wargaming - Small, development-based community.
Phone Losers of America - Famous phone phreaking pranksters.
HackBloc Collective - Organization dedicated to liberation through technology.
/r/netsec - Reddit's infosec subreddit.
DarkScience - Tech community with IRC network and news server.
Critical Security.net - Large infosec community.
SecurityTube - Large collection of hacking-related videos.
TextFiles.com - A collection of thousands of text files, articles, tutorials, videos, and audio.