Kuler is a site built on Adobe Air that is excellent for users/designers interested in the use of color. This site is perfect for mixing and matching colors or creating your own "distinct" color to use at your disposal.
Also, it is very easy to use just click the create button and start clicking on different color swabs. Anyone who has purchased paint before at a store will be used to this. Finally, a person can register an account which lets them rate, save, or share other colors.
Give Kuler a try by clicking here.