Mailing Lists:
or-talk
http://archives.seul.org/or/talk/
For discussion of Tor (the onion router).
 
or-announce
http://archives.seul.org/or/announce/
A low volume list for announcements of new releases and critical security updates. Everybody should be on this list.
 
or-dev
http://archives.seul.org/or/dev/
for discussion by the developers of Tor.
 

 

 
User Groups:

 

 
Discussion Boards:
TheOnionRouter
http://wiki.noreply.org/noreply/TheOnionRouter
Wiki for Tor (the Onion Router).
 

 

 
Chat Rooms:
#tor
irc://irc.oftc.net/tor
There is an IRC channel for Tor on OFTC.net.