Well I think the empeg's display itself is a must.
Selecting things from heirachial menus might be called for too.
Your search function is a must.
Putting the playlists in a separate frame and 'cuter' styling would be neat.

I would prefer to see the functions redesigned rather than a replication of the empeg interface. How many windows media controllers are there that look like a TV remote. ick.
I'll play with some ideas tonight.