How about these pics of the adorable actress/gamer/fangirl Felicia Day from The Guild? Granted, she doesn't flash a ton a skin, but she has a measurably nerdy sex appeal. It's sort of like somebody took a regular boring pretty girl, nudged the "geek" slider about 25%, and out came a beautiful, gawky redhead who digs MMOs, sci-fi, and fantasy lit. Save the recipe!
All of these pics come from the Felicia Day thread I just started a few days ago over in the Celeb forums.
http://peachyforum.com/forums/t/felicia-day-the-guild-dr-horrible-buffy-284451.aspx