Relocating head-unit and extending faceplate somewhere else.
I did this for a friends CarPC setup. Doing this allows you to place your head-unit almost anywhere. I used two Cat5 cables with couplers.
If you have any questions, you can post them on Mp3Car where I posted this mod in the forums or email me.
http://www.mp3car.com/vbulletin/showthread.php?t=22819