I have never done this before and I want to know if what I am wanting to do is possible at all.
I am planning on using a Laptop that I already have running linux to use as a carputer.
Instead of using some app for lauching all of the other apps (tv, fm, mp3, dvd, cd, gps, etc) I would just add launcher icons to the Gnome desktop and just use linux like normal using the touch screen. I would use a 4 channel amp hooked up to the output from the soundcard on the computer for powering the speakers.
I am also wanting a touchscreen mounted in the double din spot on the dash, which I don't think will be a problem.
The only things I am worried about are finding a tv/fm/aux-in external device and linux gps software that will talk to me (tell me where to turn and all).
It looks like that has been discontinued. What about the Hauppauge wintv-fm usb?