The Kogeto Dot lens works with your iPhone 4 or 4S's camera and their own free Looker app to capture 360-degree panoramic video. The Dot uses Kogeto's iCONIC lens and their “unique catadioptric optical system is fully AR-coated for excellent color fidelity in all environments.” The Dot attaches to your camera with either a black, red, pink, or green mount. The Dot is compatible with iPhone 4 and 4S. It's $79.00.
The Gadgeteer, Capture 360-degree Panoramic Video with Your iPhone