I wrote an article on a Color Picker that I thought worked pretty well, but then I can across something much better - I wrote about that one too. It's the Colorzilla Color Picker. It's only for people who run Firefox Browser, which most people do.
I talk about different color pickers I have used and how I think that this one works the best. It's really easy and you can use it for everything. It is easy to work, even if you are a bit of a clueless dork. Haha!
Be sure to check out the Tutorial.