Make that LESS than 1/2" thick (the Mini already is, and the 20GB is nearly). Then add a Play/Pause button please 
NOW you've got something pretty cool.
But I don't know what... maybe a remote control.
A slide-away scrollwheel faceplate be cool though, if Apple wanted a tiny device with a scrollwheel, and have room to reveal a screen underneath. Kinda of like a Danger Hiptop without a pivot. (I know that picture is not showing a scrollwheel.)
NOW you've got something pretty cool.
But I don't know what... maybe a remote control.
A slide-away scrollwheel faceplate be cool though, if Apple wanted a tiny device with a scrollwheel, and have room to reveal a screen underneath. Kinda of like a Danger Hiptop without a pivot. (I know that picture is not showing a scrollwheel.)