Cory blogged about this, but beware if you are buying music on iTunes and are prone to buying new Macintosh computers. You can only authorize three machines to play your iTunes purchased music. I recently bought a new machine and gave my old one to a friend. I have a desktop and my original PowerBook is being used by my aunt. So I had to track down my friend and have him log in as me and "deauthorize" the machine before I could authorize this machine. Which basically means, you have three lives. Lose/wreck/give away/sell three Macs and your iTunes library is no longer available, although there appears to be a "contact customer service" method of dealing with deauthorizing computers you don't have access to. Anyway, like Cory, I feel like I'm being punished for buying lots of Macs and lots of iTunes music. I can see their point, but this is yet another example of how DRM will always suck from a user experience point of view.