Via Malcolm Brown -- "iTunes 11 Interface Innovations: Good and Bad, but Not Ugly," by Adam C. Engst in TidBITS ("Apple news for the rest of us").
What I’m finding the most interesting about iTunes 11 is not its features, which are almost entirely the same as in previous versions, but the way that it thinks about interface in a rather different way from the previous versions. iTunes is sufficiently central to the user experience of most Apple users that its interface changes could give a sense of where Apple might take OS X’s interface. That may be good or bad, depending on your perspective, but it’s certainly something you should keep an eye on.
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