I reckon the nerdiest thing I ever did was buy the soundtrack to Super Meat Boy from DB Soundworks.
It comes signed and everything, and I actually felt kind of dirty for buying that sort of thing. I was never one to sleep in Pokemon covered pillows or compare my friends to videogame characters, but you know, the more I listen to that soundtrack, the less nerdy I feel, because it's just fucking awesome!
And I don't usually say that about electronic music, unless it's Ulver or some awesome 8-bitsy stuff.
I used to play WoW with the Diablo II soundtrack on, but that's not nearly as "videogamy" as this stuff.
What about you guys? Is there some kind of videogame music that you love enough to completely reveal yourself as a total nerd?
Highly recommend the Meat Boy though: