Apart from the iPhone and Apple tv additions iTunes 7.3 also changed the selection color in the left menu (blue/graphite instead of black), numbers sort below letters, so 10.000 Maniacs will be after ZZ Top and not above ABBA like before (happens with name, artist, album, genre, grouping etc.) + the AAC Encoder has a new preset: Highter Quality (256 kbps), the lower right buttons are lighter, MacBooks now have a sharp Cover Flow and there are maybe even more small changes.