This is very very cool: a new app for the iPhone from Benjamin Moore Paints. It’s called the “Ben Color Capture App” and it’s free! I am using it already. With your iPhone you take a picture, tap on a color in the picture that you want, and the app shows you paint swatches that most closely match your color. Then you can get a “strip” of analagous colors, give the phone a gentle shake and get another strip of harmonious colors. You can save any of these for future use.

Of course, if you save it, I am imagining you can then sync to the iPhoto program, and get the closest PMS color too.
052109benjymoore