Originally Posted By: Eugene
Look at the mini ITX stuff. I have a 500MHz Samba server at home running 12v @1A (12W). I boot from a CF card and leave it read only and have a copy of my laptop on my old hdd in a USB enclosure plugged into it.

You've forgot about the LCD screen. It is the primary power consumer in any Laptop or PDA. Especially if it's color and high resolution one.