Audio/Video would probably be the best place.
There's obviously not going to be anything specific to the Z for what you're doing here.
What I do with my iPhone is put it in the cup holder, but that does occasionally bug me with the cord running by my shifter.
Here's some I found on Apple's page...
Sena Premium Stand Case for iPod touch (2nd. Gen.) - Apple Store (U.S.)
Incase Clip Case for iPod touch (2nd Gen.) - Apple Store (U.S.)
Incase Leather Sleeve with Lanyard for iPod touch (2nd Gen.) - Apple Store (U.S.)