I bought a really nice CarPC screen and PSU and was planning on getting a CarPC. But now I think I might want a standard headunit. But I don't want this screen to go to waste, what should I use it for in my car? Or should I just get the CarPC?

Rear view camera, DVD screen (if your HU of choice is DVD and has video out), or when you go to the beach with friends, it can be a frisbee. J/k :)

Portable games? I noticed for a while that new phones were coming with video out !! So maybe you can hookup your phone with GPS eventually.