Actually, for (me), iTunes 7.4.5 is the ticket of my choice. (And I successfully installed in Snow Leopard after using it until the very last day "Leopard" lived in my MacMini)
iTunes 7.4.5 allows me to use the "multiple art" per track and/or album (PROPERLY)!. In further versions this is a mess.
iTunes 8 has this option too, but works so buggy that it's worthless and so is the brand new iTunes 9.
To explain this problem here would be off topic, but I posted it some time ago here (Apple Discussions) and it's still a problem unresolved.
Apple doesn't care about serious collectors and serious music organizers.
Instead, they have take time to develop "iTunes LP" wish will bring more money (to them).
If you want to know what I'm talking about go here:
http://discussions.apple.com/thread.jspa?messageID=10259324#10259324
Good Luck (to all of us)