SheevaPlug uses 5 watts of power, runs Linux, and is open-source from prong to port, according to maker Marvell Semiconductor.
In fact, prongs and ports are all you'll see on this tiny device, which has 512MB of RAM, a 1.2GHz ARM CPU and a $100 price tag. What is it good for? Anything! It comes with an SDK. Well, nearly anything: it doesn't have video-out.
The tiny embedded PC also includes gigabit Ethernet and USB 2.0 ports. Marvell did not release precise dimensions for the platform, but one early product based on the design is listed as measuring 4.0 x 2.5 x 2.0 inches. Plugging directly into a standard wall socket, the Plug Computer draws less than five watts under normal operation, compared to 25-100 watts for a PC being used as a home server, claims Marvell.