Linux Plug Computing
Read about Linux Plug Computing – Linux in a box the size of a wall-wart power supply
Lots of technical doc and schematic on the website. Order a prototype and dev kit for $99
The SheevaPlug is a development platform, targeted for use as a plug computer, and designed to run network-based software services. It features a Kirkwood Series SoCwithan embedded Marvell Sheeva™ CPU core running at 1.2 GHz. This device connects to the network using GbE, offers desktop class performance, and can be used to replace a PC-based home server for many applications. Peripherals connect using the included USB 2.0 port.
The development kit is enclosed in a plastic case that also contains a universal power supply. For developers a USB-based debug connection is included to enable simple debuggingand reprogramming.