I'd aim for reveal with discretion. I (like most here I'd wager) am into very geeky things. I've found that by talking to a girl and getting to know her well to the point where she's happy to run into you on the street and have a converstation, you can just drop the bomb "So I was watching this anime while reading comic books and playing warquest..." and she'll just have a "I didn't know you were into that stuff, huh. Anyway..." reaction.
Of course this is just my own personal experience and may not apply.