nice, very nice...
one flaw i found:
if you start the radio there is no way to turn it off (if you select a mp3 it mixes both)

Some random idea's:
* change default startup mode to music, not video
* add a exit button other then in the settings field (maybe next to the setting icon?)
* volume control with stylus would be cool (in playing now field?)
* the fact that you can't select anything (albums, photos, anything) unless you hit the tiny 'play' button in the corner of the icon is for me a bonus (no worries when scrolling) but if you add a "add to playlist" icon, then please also add it to the album list itself
* not sure if feasable, but a setting to choose between "ID tag" grouping/display and pure folder/file name play would be nice for me (lot's of old mp3's), most people with big collections use (also) a folder approach anyway for storing.