123Macmini.com has an interview on the installation of a Mac mini in a 2000 Land Rover. The system is made up of a 1.25GHz Mac mini driving a 7″ VGA Lilliput touch screen. A dash mounted Adesso Mini USB Keyboard with built-in trackball is used for input. AirPort (WiFi) and Bluetooth provide mobile networking.
This is a nice looking setup, visit 123Macmini.com for the full scoop.
Make sure to also check out the discussion forum on 123Macmini.com for more detailed info.