Wouldn't it be cool if the 4G iPods have Bluetooth? It wouldn't be used for transferring music, but it would be good for transferring contacts, to-do items, and playlist information. Imagine if you haven't added music, but have changed playlists or contacts on your Mac, you could just have it sync up via Bluetooth instead of having to get a cable out and fire up iTunes just so it figures out it doesn't need to transfer any music.