Have a look at this great small motherboard
and all the applications currently already running
and being ported to this great 2 Watt only PC
with an ARM processor and TI DSP on it.
It also has an HDMI output and connects directly to your
LCD TV screen.
http://beagleboard.org/
Also have a look at this great youtube video
explaining it all:
http://www.youtube.com/watch?v=cXr-D1wROfQ
Well, 149 US$ is maybe a bit expensive for such a small
board, but I hope the price will soon come down more to 99 US$,
then it will be a great tool to design custom designed hardware
and use Linux on it for the best flexible programs.
Regards, Stefan.