Adobe has a very cool, whoops kuhl, color picker our called Kuhler and it is KUHL!
This flash application allow you to custom pick colors for a new web design, graphic artwork, test new schemes, save them and in general see what works visually before you design it.
I consider this an excellent design aid and will be using it for my new website redesign. You can visit the application here: http://kuler.adobe.com/.
I have tried many color picking applications and this one is by far the most advanced, most interesting, and super easy to use. Even if you are not a designer, I think that you’ll have fun moving the dots around on the color wheel and seeing where the triads fall for the best color scheme. Check it out!