I like to listen to music when I study.
I CANNOT read a text book with music going as I'll forget what I have read, but I can listen to music whilst doing questions to build up a skill in some area of maths. If I'm on a hard question that is driving me insane, I won't listen to music then either.
I can't stand it when you iPod is on shuffle and none of those songs are good or you'll say WTF? I can't remember putting that on, and you spend ages searching for the right song.
I also can't stand lectures when people are listening to music in them. If these people want to listen to music go outside!
What is worse than music? Internet sites such as facebook, msn (well not exactly a site, but you know - although a fair amount of collaborate learning for me has been on msn) and VN is another place I procrastinate. When studying it's sort of like 'this topic is on --', OMG I have to see this.