soc.org.nonprofit - join
Nonprofit organizations.
Low activity, 432 subscribers, Usenet

TechSoup Second Life - join
This is a list for all members of the TechSoup group in Second Life to discuss issues pertaining to the virtual TechSoup Global office in SL, and meetings, projects and events that will occur there.
Low activity, 390 members

Coworking - join
Coworking is cafe-like community/collaboration space for self-employed developers, writers and independents. Please see the guidelines before posting to the group: http://groups.google.com/group/coworking/web/posting-guidelines
Low activity, 2092 members