I think I first met Peter Deitz at Web of Change, talking about his idea to mash up the actionable opportunities on all the platforms for social change. That became Social Actions, where you can: join an event, sign a petition, donate to a cause, give out a loan, volunteer. The things you can do come from a variety of sources, like Care2, GlobalGiving, Kiva, Idealist.org, and starting this week, also from NABUUR!