Here is an interesting article about ITX mainboards with the capability for "Disk on Chip". Seems like you could have a very small computer with built-in Linux.
http://www6.tomshardware.com/mainboard/20030326/index.html >From page 4, the excerpt that caught my attention... "Still, the Eden 1500 is not a games platform, despite the TV-out and the 16-bit sound system. The board layout leaves room for an additional memory chip that the user manual calls "Disk on Chip". This could take the form of a ROM containing a simple operating system (preferably a lean version of Linux). There are clear possibilities for use in set-top boxes or multimedia systems for home or car. The only drawback might be the boot-up time, which would introduce a 20-second delay each time the navigation system is switched on. "
