Review: BusLink USB 2.0 Disk On the Go Lite
http://www.buslink.com/ver2/Disk-On-the-Go-Lite20Gb.htm
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USB 2.0 is pretty wonderful. One area that it really shines is in using it with the new tiny portable USB 2.0 hard drives (fireware available too).I picked up the Buslink one at Best Buy and it's been great. First off, it doesn't require an external power supply. So you can literally carry this 40 gig drive (20 gig model also available) around in your pocket. I carry all my "work" stuff on it which makes it easy to work on things at both home and work.
If you're looking for a portable hard drive that's fast and reliable, I recommend this one.