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The Olloclip is a quick-connect lens solution for the iPhone 4/4S that includes fisheye, wide-angle and macro lenses in one small, convenient package that easily fits in your pocket.
The Fisheye lens captures approximately a 180 Degree field-of-view and produces some striking images. The Wide-Angle lens is great for when you need that extra field of view, approximately double that of the normal iPhone. The Macro lens applies roughly a 10X multiplier and allows you to focus the iPhone within 12-15mm of the subject.
Image source: Olloclip.
Related post: Best photographic accessories for the iPhone 4/4S