You really should put some thought into what Mark is saying here...I don't totally agree...but you do want to make sure it's not just a "want what you don't got" type deal (been there!).
I think you should just ask to dinner sometime or something harmless like that. I'm not sure what kind of friendship you have, so I don't know if dinner/movies/stuff are things you normally do together or if it's normally in a group. Either way, just try to get her alone and someplace you can talk. Pay for her, just don't act all "date-like". But get the idea in her head that you're a pretty swell guy, and dates with you would be pretty cool.
...then stick your tongue down her throat...
works every time
