nLite is a program which allows you to slim your XP installation so it only installs what you want. It's a great way to optimize a CarPC installation. It'll cut down on the amount of space your OS takes up as well as increase boot time and decrease memory usage. It may take you a couple of tries to get it right so it's best to use something like VirtualPC or VMWare (both have trial versions) to test out your installation. Keep in mind that nLite creates a custom setup CD. You can't use it remove stuff from an existing OS installation.