Just Me, Anna has posted about a competition for International Women's Day in which women's essays on how they started using Ubuntu will be posted and votes gathered to determine a prize winner. Also, Jono Bacon will be picking one at random to also receive a prize.
I should say prize package rather than just prize, as they will include a variety of neat Ubuntu and Open Source-related items.
There's also a post on it at the Linuxers blog; do take a look. Even if you also go to Just Me, Anna, the Linuxers article is worth a look for the elegant Ubuntu Women logo and the other articles.