Cogent makes computer the size of a stick of laptop RAM
It typically consumes less than a watt of energy (750-1200mW), making it cheap-running and eco-friendly, but is it good for anything more demanding than a fancy fridge's LCD display?
Worse, it comes with a somewhat larger carrier board, which has the USB and ethernet ports and what-have-you. The initial excitement of "MAME machine inside a joystick!" fades to the realization one can get more muscle, at a similar size, with Pico-ITX.
This little fella is more expensive than Via's miniaturized wonder, too, with a total cost of about $600 for the CSB737 and carrier board together.

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Gumstix are cooler:
http://gumstix.com/index.html
Man, how could I have not discovered those before? Wonderful. Cheers!