One of the biggest advances on the latest Zune MP3 players is the new Zune Pad navigation interface. That quarter-size circle (squircle?) on the lower half of the Zune works as both a touch pad and a four-way click pad with a center select button. It sounds complicated, but it's actually very intuitive. Buttons for the menu and for play/pause sit in the top left and right corners of the pad. Is it just us, or does the Zune navigation look like Mickey Mouse's head?