I found a intriguing device. It's a 40GB PD7X drive powered by 4 AA batteries for less than $200. It also has an 8-in-1 card reader than can handle CF type I, CF type II, SD cards plus 5 other formats. Here's the nasty long link with the best price (limited time only, of course).
Here's another link to the same devices (look at bottom of page and select items marked as 7200 RPM Compact Drives (20GB, 40GB, 60GB, and 80GB):
Some professional photographers gave feedback saying build quality could be better, but functionally it works great.
I was wondering if any Z users had experience with one of these. It would overcome the usb-power issues for spinning up since it is self-powered. Also, would movies be able to play "live" from this device or would there be speed issues?