wikipedia: carputer definition
wikipedia has everything.
Example hardware (external links)
Listed below are some examples of common hardware used in the construction of carputers. Many of the items below can be found at multiple vendors, the links provided are to some common places to buy and do not constitute an endorsement of any kind.
Opus 12V DC-DC ATX Power Supplies
Lilliput VGA touchscreen monitor
Xenarc VGA touchscreen monitor
The BR3 OBDII serial interface for automotive diagnostics
The ScanTool OBDII serial interface for automotive diagnostics
The Contour Shuttle Xpress, a tactile input device ideal for cars
Epia M10000 motherboard, a Mini-ITX motherboard ideal for use in cars
MP3Car.com store, a good source for many of the above
CarBotPC Store, dedicated to in-car computers and accessories
Custom Carputers - In-Car Multimedia Entertainment Systems
Example interfaces (external links)
MediaEngine - A Microsoft Windows based software "frontend"
FrodoPlayer - A Microsoft Windows based software "frontend"
RoadRunner - A Microsoft Windows based software "frontend"
DashPC - A Linux based software "Frontend"
CCarProject - interface to play your songs in car (macintosh only).
 - Windows XP Media Center Edition.
PhoneControl.NET - A Microsoft Windows based software that allows you to control your mobile phone from a Carputer / MediaPC.
MP3CAR.COM - A community of carputer builders
Digital-Car.co.uk - A community of UK carputer builders
Carputers.org - A news and blog site of and by carputer enthusiasts
soloCarputer.com - comunidad hispana de carputers - Hispanic carputer community
Carhacks.org - Car computer technology blog
fluxmedia - centrafuse home
Custom Carputers - Sales, Service and Installations
CARPUTER.NO - Norwegian community of enthusiasts. Forum and shop
CartFT.com - CarPC Shopping
Retrieved from "http://en.wikipedia.org/wiki/Carputer"
Category: Automotive accessories
Okay i thought that was sweet.