http://opensource.com/life/13/4/increasing-foss-participation

Marina Zhurakhinskaya has a very factual roundup of the recent outreach programs that help in increasing FLOSS participation by women.

"Targeted outreach programs have proven to be very effective in bringing in women who are interested in technology, but who have stayed out of particularly male-dominated areas....These efforts address the reasons women are staying out by reassuring women there is a supportive environment and providing a focused opportunity to gain experience...."

Wikimedia Foundation participated in the last round of the internship program she mentions, and also will participate in the next round.