Well, I've been looking and I would want it to do the GPS, bluetooth for phone, play mp3's and dvd's.
So all but gaming (although I might throw that in as my mate had a PS1 in his MR2).
I think it would be a lot better than buying a seperate sat-nav, multi changer amongst other things. I have seen it done in a focus and MR2's but wondered if anyone had done it in their clio. I'm thinking of putting it in the dash where the head unit is and moving the vents, as it looks a perfect square for the tft touchscreen.
Although it will have to wait until the end of the year when I have enough cash for a complete system.
Oh and BTW in car dvd's are great for passengers or when you are waiting for people, or just chilling away from home.