I could not find any well documented LINUX based setups. As you will see, with a little effort you can create a powerful (and useful) Car Computer. With the new version of my install, I have extended my CarPC's capabilities even further!
LinuxICE is a Linux distribution developed specifically for car computer use. It's based on Ubuntu, but it has been slimmed down and optimized for performance in the mobile environment, and has features that other Linux flavors lack for in-car use