Buy It Now at Kogeto, $80
Not only is the Dot one of the coolest iPhone camera accessories available now, it was one of the Best Gadgets of 2011. When combined with the free Looker app, the attachable camera lens allows you to capture immersive panoramic video on your iPhone. Once you record the video you can use the app to watch the recording from a number of different perspectives. It's dope, once you use it you'll be hooked.