I knew I'd forget something!

V) An SDK for the display themes!

W) Some sort of UI preferences that are remembered. A good one is using line out instead of speakers. The volume display is silly in that case and maybe the UI could be optimized for each case.

X) Make it check for new music automagically.

Y) Don't stop serving music when checking for new music (esp. if you don't do X, its disruptive and takes a couple minutes to check for 8000 songs)

Z) Something about the UI messes with my head. It took me a bit to get use to the menu and select buttons. If I want new music, I press select for every key press, except the first one, which is silly. Let the select button act like menu (esp. when I have line out and don't need volume control anyway). Maybe some sort of preference for UI behavior.