- For Silicon Valley geeks there's Google executive Marissa Mayer, who apparently has a distinctive laugh.
- If you want to go historical, 19th century programmer Ada Byron Lovelace would be an excellent choice.
- On the other hand, if science fiction is more your style, you might consider dressing as robotics expert Dr. Susan Calvin (Asimov's version, rather than the movie version if you are true SF geek)
Check out the full post for more suggestions.
I would add Rear Admiral Grace Murray Hopper to the list. She not only was a great programmer, but also wore a chic uniform.
Check out my other suggestions for Geeky Halloween Costumes.