i just applied... quick question.

my itunes has lots of crap on it. about 100g. but i have a 20g ipod with stuff i listen to all the time.

would it be cheating if i just used my ipod library and exclude what's in itunes? because otherwise it's going to be full of crappy movie soundtracks and such...
Use whatever you want; just don't use a playlist. There was a discussion a little while ago as to whether or not it's better to have more to choose from; personally, I like the idea of having ANYTHING show up, since sometimes you get bonus points for having something totally off-the-wall.

The official scrollwheel tournaments will probably have to be more specific in terms of answering that question, but for now, do whatever you want.