http://www.ionics-ems.com/plugcomputer.html
Consumes about 5 watts
It's about the size of a small wall charger
Runs Linux on a 1.2GHz ARM processor
1GB of RAM, but 1/2 of it is NAND Flash
no hard drive, but there's a USB connector to connect externally
There's a developer's kit
Pricing is about $99US, expected to drop to $49US when produced in quantity
"It is a small, powerful computer. It plugs into the wall socket and an ethernet cable, and can run network-based services that normally require a dedicated personal computer. The plug uses low power and utilizes only a small fraction of the energy consumed by an always-on desktop computer or laptop."
"The device is meant to simplify the management of digital assets by offering PC-like performance at an inexpensive price. A software service can be bundled together with a plug computer and can be targeted at different market segments. Everyday consumers can use the plug for media sharing and backup services."
Here's a 'plug farm' with 6 computers

I can probably put one of these farms in a corner and not have my wife notice. No explanations necessary about buying lots of computers for testing...
Now let's work out how to set up these farms to test our engines!
more info:
http://www.pcmag.com/article2/0,2817,2351505,00.asp
http://www.marvell.com/featured/plugcomputing.jsp
