It is an arcade style motorcycle racing gaming by Freeverse which is also a game creator for Macs. Wingnuts Moto Racer is a nice debut game for the iPhone with decent control once you get past the learning curve.
The tracks are beautifully designed and the wide angle is great for seeing whats lies ahead in a very realistic way.
You can buy, download and sync the iPhone game application to your iPhone via the App Store (iTunes link here). Here is a demo video of WingNuts.