Every time I get a new mobile I plan to make some custom car mount with charging and audio outputs. Never got around to doing it though. Maybe if I get a Note it'll be worth doing with it's huge screen and I doubt it'll fit too well where I put my mobile now (on the dash next to the speedo).
I did once make a car computer though. With a beige desktop tower. And an inveter and keyboard. There was no screen so controlling it (only used for music) was a pain so it didn't stay in there long. Also it was a little awkward for people sitting in the back of the car with their feet resting on it :)
Is that a window sucky one? One of those would probably do nicely, although I've never really liked having it off the window of the car, would prefer it stuck somewhere else, like a bit above the radio.
I've seen some rather clever custom center consoles with proper moulded panels around touch screens with car computer setups. Mine was just going to be more like a dock but with the cables routed behind the dash and connected to a false panel I have just above the radio.
One by the bed, for quiet/silent mode at night, and maybe to turn mobile network off too. One at work to do something similar. For women (and I suppose the odd few men) one in the handbag to turn the volume up loud.
I quite like all these new cheap toys coming out for playing with and encouraging creativity, the pi, these stickers, the ouya etc. technology in general is good at the moment.
I just got a proper case for mine as my lovely son tried to eat it last month as my home made case looked like a toy he likes to chew on.
Other than making it a bit more baby proof I have been constantly upgrading and placing with XBMC, I finally have a build that I am happy with for watching tv shows and films BUT now I have a problem with the photo viewer as it hangs every time I try and open a directory.
It's still fun to play around with and the wife actually uses it.
I'm going to give it a go in my car since I have a tablet mount. Still need to check the official cable with my chargers to make sure it charges.
I've recently been using my phone as a WiFi hotspot quite a bit and it's pretty much flawless so should be reasonable in the car.