National Code Pink: Women for Peace
A women-initiated grassroots organization dedicated to ending the wars in Iraq and Afghanistan and reallocating the funds spent on the military to domestic issues like education, healthcare and Social Security.
UF Chapter of Code Pink
The University of Florida chapter of the national organization
National Organization for Women
Started in 1966, NOW is the largest organization for feminist activists in the United States.
Wikipedia: Feminism
Yes, I know it's Wikipedia. But it's actually fairly accurate.
Voices of Feminism Oral History Project at Smith College
Project to document the organization of womens movement in the 20th century.
An online blogging community for feminists and their allies