I saw these pop up on Giz/etc a while back, but this is the first place I've seen them for sale. They're a little pricy, but are just oozing with potential. Little 7" displays that run entirely off one USB line.
http://www.thinkgeek.com/computing/usb-gadgets/bfa3/
specs, for those who haven't seen them:
Display size - 7"
Display resolution - 800 x 480
Brightness - 350 cd/m2
Contrast ratio - 400:1