Here are more resources for public service projects, local government agencies, and major relief organizations.

Other sources:

http://www.senate.gov/senators/contact/

http://www.house.gov/

http://www.un.org/en/sections/resources/students/index.html

Relief organizations:

http://www.globalcorps.com/jobs/ngolist.pdf

http://thewaterproject.org/about_us

http://www.heifer.org/