Human Rights Watch:
Administrative, research internship positions available in the US and abroad.
http://www.hrw.org/internships/undergraduates/undergraduates.html

ACLU National Legal Department:
Summer internships available to undergraduates. New York, NY.
http://www.aclu.org/jobs/careers/16656res20060628.html

Council on Foreign Relations:
Internships in Washington DC or New York in public relations, international relations, policy corporate program, publications.
http://www.cfr.org/about/career_opportunities/internships.html

InterAction:
Internship in Washington DC dealing with international development and humanitarian nongovernmental organizations.
www.policyjobs.net

The Institute for Foreign Policy Analysis:
Research internship in Washington DC in matters of foreign policy and national security.
www.policyjobs.net

Lambda Legal:
Legal Assistant at this national organization committed to achieving full civil rights for members of the LGBT community. Position in LA.
www.lambdalegal.org