I did a search and did not see this posted here yet.
"It was one of those waiting to happen customizations from the get-go: The iPad has been installed in a car dashboard. A project of Sound Man Car Audio in Santa Clarita, CA, the installation video below shows the dock connector hook into an Onkyo ND-S1 Digital Media Transport, Audison Bit One D/A converter and, appropriately enough, a McIntosh amplifier."
http://mashable.com/2010/04/05/ipad-car-install/
"It was one of those waiting to happen customizations from the get-go: The iPad has been installed in a car dashboard. A project of Sound Man Car Audio in Santa Clarita, CA, the installation video below shows the dock connector hook into an Onkyo ND-S1 Digital Media Transport, Audison Bit One D/A converter and, appropriately enough, a McIntosh amplifier."
http://mashable.com/2010/04/05/ipad-car-install/