While MySpace is the new GeoCities, userscripts.org has a wide variety of Greasemonkey hacks that lessen the amount of throwing up in your mouth you do when you visit the site.

The only problem with useing a desktop is: What do you do when you turn the car off. Lets be honest, no one likes startup times. You need a battery to keep the computer alive when you turn off the car battery. This way you can just put the computer to sleep, and turn it back on when you need it.