I'm thinking of using a laptop size hard drive in my case. Since you can get those up to 100GB now, for not a ton of money, it's a good option. Once I do at least one of these builds, I'm going to try hooking up with a local performance shop (does vehicle alterations and such) to see about providing systems for them. With the Via boards, you can get the regulators that will kill all power to the board when the ignition is off (to save battery life). It's either that, or install a secondary battery to feed the computer, but also have it charging off of the main electrical system. That can probably be done, so it would make for a bit longer run time before shutting down (after the ignition is off). With PCI cards now a real option, we could even install a bluetooth module. OR, use one of the internal USB headers to feed a bluetooth adapter. That would make it self contained and allow the use of a BT keyboard and mouse, as well as other items, with the system. I can see a lot of possible uses for the computer.