Great question. Really any small camera you can think of. As long as it has a standard 1/4-20 thread you can fly it. The EZ-Steady is extremely versatile. We definitely recommend the iPhone 4 and our new GoPro Hero2 though :)
Let's just say this, we ran it over with a motorcycle before and it still worked perfectly. The top plate is machined out of a solid piece of billet aluminum. The arm is made of a solid piece of aluminum. This thing is pretty robust. Everything is either powder coated or anodized. These finishes won't flake off like some paint will.