What about the Intel Atom, there is a version targeted for kind of embedded systems. Think its called z5xx or something.
Its a x86, so i suppose its well supported? i'm buying 1 soonish, board, with no fan, 2GB ram , and a case. Adding a semi old harddisk 2.5" from my own drawers. Total is about 200 Euros. Or is it to fast for you ? :) I think it use about 30 W because of a chipset that uses quite a lot of power. Something about a chip set that uses much more power than the cpu (about 22 W) But there is a chipset with lower wattage, but you have too look for it. Check out this wikipedia article, see "power requirements" http://en.wikipedia.org/wiki/Silverthorne_(CPU) And then there is offcourse the core duo bugs?, to think about, isnt there? mic