I usually find software upgrades a pain in the behookie - unnecessary downloads and restarts for no perceptible gain in functionality.
However, to my great surprise I'm quite enjoying the latest version of iTunes (8.0.0). I'm having a bit of fun with the 'genius' button. Now I know that it's just another way to try to get me buying more music from the iStore, and in essence it's no different from marketing ploys used by other companies, like Amazon. But it has one feature that I like - it generates playlists from your music library. It's much more random than I would be if I selected the music myself. I like that!
The big question is how long will I resist buying more music - that I hadn't intended to buy - from iTunes?