BMW E46: Running OS X Snow Leopard
Running Mac OS X Snow Leopard. GPS, I-Bus, and rearview camera, touch panel, etc. are connected via USB. iPhone and Apple Wireless Keyboard can also be used for controlling the computer via Bluetooth.
The bezel for the LCD is made by Mr. Rich Silva (www.mybimmer.net/CarPCLCD.htm). His bezel is beautifully crafted.
The headunit is relocated to the glovebox by extending the cables. It can be hidden when not needed.
Aside from my old MacBook Pro dedicated for this project, the whole modification costs a lot less than the other 2-DIN type systems.