And proud of it!
I play D&D, and just finished a set of Magic the Gathering game with a friend who was over. Last night I arranged a LAN for the student organization for nanotechnology master students and let's see.... Whatelseisparticularlygeeky.... I regularly visit xkcd, I know my way around the windows registry and use mac os for it's UNIX core as much as for it's no-hassle GUI. Plus, when I write anything worth reading, be that letters, CVs, applications, papers, articles... Whatever, I use LaTeX. Ohyeah. And if I draw something in my papers, graphs, figures charts... I use tikz. (GUI? For graphics processing? How quaint!)
Then again, I suppose it's enough to say "I study nanotechnology. Come on! Let's discuss electron microscopy and quantum effects!"
Weird Al's "White and Nerdy" might well have been written about me.