• http://www.econ.iastate.edu/tesfatsi/netgroup.htm
• mapping a terrorist network using publically available data http://firstmonday.org/issues/issue7_4/krebs/
• Valdis Krebs / orgNet provide social network analysis software and services to the consulting community » http://orgnet.com
• http://smg.media.mit.edu/projects/SocialNetworkFragments/

• Search your area for groups with your interests: http://www.meetup.com/
• Connecting empty urban space to people (London): http://spacemakers.ning.com/
• network to help each ohter to find work (London): http://alpha.signpostr.com/
• network for gardeners (London): http://metabolicity.ning.com
• network for finding stuff people give away for free: http://www.yoink.com/
• p2p finance: loans between people in developed and developing countries http://www.kiva.org/
• p2p finance: community funding model for technology startups http://www.growvc.com/
• shared physical workspace: http://www.workatjelly.com/
• collaborative real-time editors (for Collaborative Design) http://www.twiddla.com/ http://etherpad.com/

more at category network