If you're looking for a fat portable hard drive, Fujitsu's 500GB HD5 hits the spot. A simple black slab, it's pretty enough, but quiet operation is more important, and it didn't irritate. Read-write speeds hit 20-25MBps (xbench results), and it ran just fine from the USB port. A USB power adapter is supplied for use with unpowered hubs or ports that won't supply overcurrent.
Fujitsu also claims it uses 35% less power in the long run compared to previous models, and provides a copy of Acronis True Image Personal Backup pre-loaded.