NOVA now supports gyro controls. Just tried it yesterday and it's pretty amazing. It does take some time to get used to. I believe Real Racing also uses the gyro.
Yep, NOVA is where it's at. For the best experience, play either standing up or sitting in desk chair that can spin. Also, try inverting the controls if it feels awkward.
On gunrange how come I have to keep re calibrating to the center of the screen every couple minutes? It doesn't seem to stay were I set it when I put my iphone back infront of me.