William Hurley uses PBwiki, Google Apps and Facebook to organize an event for 2000 people with 40 volunteers in 8 days (he says.)
"Why aren't more nonprofits and local community groups reaping the benefits of the cloud? I would bet the main reason is related to the lack of exposure they have to the technology. Perhaps they simply need someone to point them in the right direction."
http://weblog.infoworld.com/whurley/archives/2009/03/cloud_computing_7.html?source=NLC-DAILY&cgd=2009-03-16