The MusicBox will be enabled in next firmware coming december 2009. It will support internet radio both live streams and shoutcast based streams as well as will be better for full music playback. Local HDD/USB stored music will also be supported. We consider to add to it later on the ability to serve music even as an iTunes server. 

You will be able to play the entire content of music folder by clicking PLAY button while your focus will be on the folder you wish to play its inside content.

The Navigation will be as easy as clicking the arrow keys on your RC. 

The left / right panes will be flipped with animation so not always visible.