I guess the current iTunes interface in Leopard looks more modern than the outdated aqua. Look at the thick and ridgy scrollbar in aqua and compare it with the flat one in iTunes. Doesn't the scrollbar look more modern in iTunes? If you look further into iMovie, Aperture, etc., the dark gray interface is the most modern and aesthetic looking and I hope Apple implements these modern interfaces all over their already most beautiful OS!! I would rather leave iTunes as it is now ;)