In this week's podcast, Major Nelson hosts an interview with more information about the upcoming Xbox 360 HD-DVD player.  One of the questions we've gotten is about what the dashboard interface will be.  The team's come up with an interesting way of doing it, basically letting you use the up/down arrow key after selecting the drive interface.  These aren't final, and are subject to change. 

No attached HD-DVD drive:

With HD-DVD Drive attached: (first two show interface with a disc in the drive)

[Edit: Changed animated gif, edited text below]
[Edit2: Changed images for Open Tray and Open HDDVD Tray]