For everyone who has talked about adding computers to their cars. This has been what I have been planning to do, just so many other fun things to do to my car first. Here is a great site and resources for anyone looking at doing this project.
First check out
These guys rock, everything you need to know about putting a pc in your car.
Here are the things that I really think are interesting.
1) This is 8 relays that plug directly into your computer and are controlled (requieres linux) in other words, anything relay driven in your car could be controlled by the computer. Windows, locks, defrost, trunk, lights, etc. . .
Looking on their site today, it looks like they are creating a new USB controller for this, better than having it in your pc, i cant wait to see that.
2) This has been my main hangup with putting a pc in your car. How do you boot it and shut it down properly? You dont want to drain your battery, you want to guarantee that it shuts down and stops draining power. Well the final answer is coming to dashmatics soon. and thats the startup and shutdown circuit. They had an initial product up previously, but when i looked today looks like they are making a new version and will have it out soon. Basically what this does is when your car starts, it boots your pc, when you shut off your car, it forces your computer to shutdown, taking care of all of the power issues.
3) ODB II interface. I have odb I unfortunately, but they sell an ODB II interface and talk about the linux software for monitoring it.
4) their system also does GPS, DVD, MP3, has a wireless network sniffer, and soo much more. Dig around the site. Its everything you could want for putting a pc in your car.
The one thing i would do different than them is get an indash dvd player, instead of using the computer. That way i dont have to go to the trunk to switch movies, and also there will be some shock protection.
Please note, this is not an advertisement, i have nothing to do with any of these companies. I was just so impressed with their products, and previous topics on this, i thought everyone would like to see the info.