The unit I have has 8 buttons on it and it fits on the rear of the wheel on the right.
The buttons are

• vol up/down
  
• track up/down
  
• within track fast forward/rewind
  
• Source select (Which I don't use at all)
  
• Play or Pause (The button which was broken, but is now fixed)

Hopefully we will have the option to reconfigure the buttons at some point, as I don't use the source button or volume control (I use my JVC MD/CD for that), and those buttons could work the menus instead..
(You still have to use the full remote, or front buttons to work the menus, but once you've selected a playlist, there's no real problem.. =)

Jazz
(List 112, S/N 00030, 4 gig blue)