The Sidebar Returns to Oz - The last few versions of iTunes (and the Finder, and Mail) rinsed all color from their sidebars, relying solely on tiny icons and text to help users differentiate among the items.
That may be good or bad, depending on your perspective, but it’s certainly something you should keep an eye on. 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. 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.
TRASH IT FOR MAC 10.6.8 UPDATE