I always thought it would be awesome if a girl could consistently challenge me on my sports knowledge. Seriously, I'm not sure why that wouldn't be attractive? Having someone to talk to all the time about hockey would just float my boat (among other things, of course... ). My current girlfriend has no clue about anything sports related, except that she or I might play the occasional soccer game once in a while.
Oh, and now I have to go for a cigarette. I thank this thread for reminding me.