I just picked this up a couple of days ago and I can't believe I didn't have anything like this sooner.
Adobe® Kuler lets you capture color inspiration anywhere you find it. Capture colors from a mural, garden, or wherever you happen to be with a snap of your iPhone camera. Browse, create, and customize themes for your designs – all on your phone.
This is seriously only of the smartest, most useful apps I've ever used. Have you ever been out some where and just been totally inspired by a color scheme? Adobe Kuler will capture a photo and then break out the color scheme for you.
Look, we all know that color in the 3D world is completely different than on your 2D computer monitor. Part of what makes this app so awesome is that it will pull out the shades and tints from the natural gradation seen in every day life! Fantastic app. Highly recommended.