I always like to think that nerdy and geeky girls are just the same as any other girl, only a little bit better! nerdy girls like things that a nerdy or a geeky guy will probably like and you know, most of us guys are nerdy or geeky in one way or anther.
What is the best thing you can get for your nerdy girlfriend? There are a couple of really cool things that I can think of. You can get some nice ideas on the Gifts For Nerdy Girls page, they have some non-gadget stuff like Necklaces and gag gifts which your geeky girl might like.
Hey I know, why won't you get your girlfriend a giant sword! this is something she will absolutely love!!