Westmoreland Volunteer Corps - a year long service placement
http://www.westmorelanducc.org/boards/Volunteer_Corps/Volunteer_Corps_home.htm

Westmoreland Volunteer Corps has positions in DC and Suburban Maryland. The Corps accepts applications in the spring for one-year commitments beginning the following fall. If you are a college senior with a passion for social justice and an interest in helping others, this very successful program may be a good fit for you. WCC has a 20-year history of changing lives of those who volunteer and those who benefit from their involvement.

Requirements
-Minimum age 21, with a college degree or related work experience
-Willingness to live simply on a limited income, cooperatively in community with 4 other young adults

Visit the website for further details and application materials.