The NEC CS56 "Netbrain" office server uses a TM5600 Crusoe processor running Linux 6.5 Secure Server Edition while consuming less than 20 Watts of power. The unit has no fan and even comes with a built-in UPS and optional RAID card. Measuring 145 x 240 x 220mm (W/D/H) and weighing in at 5-6Kg, the small server includes an internal power supply and can be placed into a 19" wide rack in 2 and 3 unit wide configurations if desired.

The CS56 server in the most advanced version contains a 600Mhz TM5800 Crusoe processor coupled with the Ali M1535 Super South Bridge, 192MB SO-DIMM memory, an ATI-mobility graphics chipset, 40Gb (x2 for RAID) hard drives, optional CD-ROM, 1 serial, 2 USB, 1 parallel, 2 PCI, 2 PS/2, 1VGA and dual RJ-45 ports. Internally there are up to 2 PCI sockets, and room for compact flash storage.

Sorry folks, as far as I know this one is still only available in Japan from the manufacturer.