The 2TB MyBook Live is an interesting desktop NAS, as it packs not only a 2TB HDD but also Debian Lenny on some peculiar hardware:

A WD Caviar Green 2TB desktop hard drive with 64MB cache, using "IntelliPower" technology

256MB RAM

A PowerPC-based APM82181 CPU running at 800Mhz, single core, with built-in RAID acceleration

One multi-color LED in the front

Gigabit Ethernet

Debian Lenny for PowerPC