The iRemoco Controller can be attached to your iDevice, transforming it into a toy controller. If you use the free iRemoco App from iTunes, then you can use on-screen 3D joysticks or motion control to fly the iRemoco helicopter. Because the helicopter responds to the tilting of your iPhone, it offers a very interactive and intuitive way to guide it.
Pre-order it exclusively from Kickstarter, for only $99 (includes USB charger and spare rotors). More details found at iRemoco.