A lot of designers use Photoshop as a design and mockup tool. And in doing so, one of the last steps can be to get a lot of the colour information out so things like gradients and dynamic text can be rebuilt using HTML, CSS, Cocoa or some other language.
Sampling a colour, then opening the picker and tabbing or double clicking the HEX field, then pressing ⌘C (Mac) or Control-C (Windows) requires a few steps.
If you have a final design document and you'd like to copy lots of colours to the clipboard, what's the fastest way to do this?