Move forward to the new 4g LTE PlayBook and some spare time with the car :-) I have created a mount using the stock radio trim. This mount allows the PlayBook to be inserted/removed and allows for the audio jack to be connected. I've installed a few apps that are automotive related including a couple of navigation apps. Future plans might involve a BlackBerry Music Gateway and a power source (currently no charger for the PlayBook). Watch the video below and get a bonus tour of the car itself :-)
Here is my inspiration. This is the QNX Jeep with a beautiful touchscreen interface...looks strikingly similar to a PlayBook doesn't it?