One thing that I don't like about the way iTunes handles things is thats not multi-computer friendly. I have my desktop running windows, my macbook and my iPhone. And I want the music on them to be the same, all three of them. Now before today, and really I should have googled this before today, I had always just been faced with the "Do you want to sync with this computer? Doing so will erase all the files currently on the device." message which I clearly didn't want to do. Then today, after finally googling the problem I came across the answer.