Color Picker

Is there a way to choose colors outside of the Photoshop application using the Color Picker? Coming from Macromedia Fireworks, I have become accustomed to using the Color Picker tool within Fireworks, which enables you to pickup any color outside of the Fireworks application. I have seen thrid party tools that let you choose colors from various programs, but they just give you the color scheme and you must type in these color values within Photoshop. Any help would be greatly appreciated.

I'd take a screenshot, paste it into photoshop, pick up the color and delete the screenshot layer.
:p