I'm a fan of car PCs and even helped design and implement them before for friends and myself. It's a rewarding task if you have a use for it, from a media library to an in-car mapping system. There is a large gallery
of photos and descriptions of various car pcs you may find interesting. Not enough specifics on the design of the particular machines, but very attractive. Modern cars are coming more and more computerized, but not everyone can afford something like that. Just about any car or truck, though, can be modified to support an onboard PC for any task you could put your mind to. Some of the images are fantastic. Give it a look.