I heard about this on the radio this morn. Monster Truck Destruction
The guys developing it live in my area which was a nice surprise. It's currently in Beta and is being made for iOS(iphones etc..), Andriod and Facebook.
I've had a real quik go on the beta and had quite a bit of fun with it.
The driving model is pretty good and I like the fact you can break up the other props on the course! I'm looking forward to trying the beta on my main rig to see it with better gfx n smoother gameplay(the work laptop doesn't run it too well) and then will give'em some feedback on their forums.
I think this game will be pretty good on an iPhone/Andriod phone, so I look forward to seeing future progress on this...and checking it out on my iTouch!
Tha vid below is from an older Beta:
Da Rig: Intel i7-920, Asus P6T, 6Gig Patriot Viper II 1600 DDR3, 460 'Talon Attack' SLi, 1+TB o HDD, Windows 7 64bit