BENEFITING: BORGEN PROJECT
For anyone who is unaware, I am currently an intern at The Borgen Project (http://www.borgenproject.org/) - by the way, everyone should check out their website!
Anyway, The Borgen Project is a nonprofit organization that is /entirely/ volunteer-run (even the President of the organization does not receive a salary from it). It's primary goal is to change policy to help the world's poor on as large of a scope as possible. They want to create large-scale, long-term, systematic change. (They have also done some pretty awesome things, for example, they meet with around 100 Congressional offices a year, have found cosponsors for various legislation, and helped get the Global Poverty Act passed in the House of Representatives).