Ada Lovelace Day is 24 March 2009
Ada is an amazing role model for women in science and technology - more here. I'm always surprised to hear from people who have studied computing or programming but who don't know about Ada.
Also worth looking at - to put Ada's achievements in context - is Women's Status in Mid 19th-Century England by Helena Wojtczak. Women have come a long way since then but we still need to be watchful for our rights to education and participation.