Hues [$2.99 Mac] is my new best color friend. They took the standard Apple color picker and set it up as a standalone app that will not only pick any color on my screen, but give me the Hex, RGB and HSL codes to boot - and save the color on the color board so I can use it again from any Mac app with a color picker. It now has a permanent place on my Dock so I can get it any time I need it.