I'd like to see the "rollers" taken out of the navigation. I don't think they look very pretty anyway, the horizontal line can easily fill up, and zone names over a certain number of characters are truncated, and it's very difficult to know where a particular item is - and the playback controls are not easy to use.
The up, down, left, right, page up/down keys etc (on keyboards on remote controls) should operate the cursor in the main media item browser and behave according to accepted and common behaviour. On hitting a designated button (Menu?), what we currently know as the Rollers would maically pop up as an overlaid, attractive, hierarchical menu (similar to, but bigger than, a Windows right-click context menu) that is navigated with the arrow keys etc. Pressing the menu or exit button returns to the item browser or, on a touch screen, simply tapping out of the menu area dismisses it.
Access to zones, playing now, display view and playback controls need to be made a lot easier.