Social Effect: Social Effect: Top 100 Online Volunteering Sites. I'm a lot further along in my drive to decode the global volunteering landscape, so for all you potential volunteers out there, here's a more definitive directory: General & Online Volunteering Social Collaboration SitesNGOs & Transnational Organisations that accept VolunteersInternational, Development & Travel VolunteeringNiche Volunteering - Medical, IT, Teaching etc.RegionalVolunteering Information & ResourcesI know it is a very 'developed country' oriented list, but this is primarily because it is difficult for me to evaluate sites that aren't in English!
National Alliance to End Homelessness. Change.org - Start, Join, and Win Campaigns for Change.