Carry a color picker and eyedropper around in your pocket. Great for designers and artists, and a game changer if you're colorblind!
ColorMyWorld helps you find colors quickly with your camera in real time or from a picture. Not only does it provide precise RGB values, but it tells you the general color it belongs to. If you're colorblind (like me), you'll never mix up red and green again.
It also supports Pantone color matching.