Mailing Lists:
User List
https://lists.sourceforge.net/lists/listinfo/ge...
List for geoserver users.
 
Developer list
https://lists.sourceforge.net/lists/listinfo/ge...
List for developers of GeoServer
 

 

 
User Groups:

 

 
Discussion Boards:
Nabble board
http://www.nabble.com/GeoServer-f1193.html
Same as user lists, but you can interact from the web
 

 

 
Chat Rooms:
GeoServer IRC
irc://irc.freenode.net#geoserver
Meetings held here, not always someone there