Olloclip

The olloclip is a 3-in-1 lens addition that snaps-on to the corner of your iPhone 4 or 4S. It has a fisheye lens, a macro lens, and a wide-angle lens to give some extra fun and functionality to your iPhone's already great camera. It started on Kickstarter and was more than 400% funded. The olloclip is easy to toss in your bag or even your pocket if you're heading somewhere you may want to take pictures with.