I ran across a link to this online palette generator. If you have an image which has colors you like, this little application will generate a five color palette for you and give you some options. There are other online color generators. Here is a post that lists a few more.
I often use the eyedropper tool in Photoshop or Art Director's Tool Kit for picking colors out of an image; but this is a neat little way to get a harmonious selection of hues from an image.