Center for Gender Equity of the University of California, Berkeley. Provides advocacy, education and support services to both women and men of UCB. Several other universities have similar centers - google "Center for Gender Equity".
iVillage -
bills itself as 'The internet for women', seems to have lots of women's health information.
Mariah Women -
MARIAH'S women-only trips combine active river wilderness adventures with exploring the natural and cultural environments of unique International destinations in the safe and secure company of other women!
Feminist Majority Foundation -
a cutting edge organization dedicated to women's equality, reproductive health, and non-violence.
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http://gendercenter.fhi360.org/
Launched in 2001 to improve girls' education and women's empowerment throughout the world. Has a programmatic focus on girls' and women's issues to ensure equal access to life's opportunities as well as national economic growth and overall human development.