SortaNAS

[stevech]

$49 at Fry's (sale), and maybe a bit less at some web sellers.
Hitachi/SimpleNet device http://www.simpletech.com/products/storage/simplenet/simplenet.php
Size of pack of cigarettes
Ethernet + two USB

Networkizes USB drives.
NTFS and FAT
Web server for admin, and secure shell (SSH) option. Embeded Linux. Open source.
FTP server
iTunes media server

Nice.
No speed demon: just 3Mbps. But handy.

I have a 32GB thumb drive plugged in; using with SecondCopy. Small/low power.

I also tried a number of USB hard disks around here. OK.