I'm planning to put up some photos of female engineers in my cube at work, to serve as role models.

Allison Randal — Perl hacker extroidinaire
Marie Curie — first woman to win the Nobel Prize (1911) — physics and chemistry
Sally Ride — first American female in space (1983) — physics
Eileen Collins — first female Shuttle commander (1999), test pilot, flight instructor — operations research
Susan Kilrain — second female Shuttle pilot (1997), flight instructor — aerospace engineering
Pamela Melroy — second female Shuttle commander (2000), test pilot — geoscience
Peggy Whitson — first female ISS commander (2007), holds record for most EVAs and most time spent in EVA of all female astronauts — biochemistry
the various folks who work on the Mars Curiosity Mission

Possible places to look: