ColorZilla is an indispensable Design Tool. I regularly use it to identify colors in client supplied logos and images and to match the general color tone of web pages to prominent photographs displayed on the same page. ColorZilla's feature that automatically copies picked colors to the clipboard speeds the process of going back and forth to Photoshop to create matching graphics. The UI is clean and intuitive. And the CSS Gradient generator quickly creates the code for the much lighter weight option of using CSS instead of pixel image gradients. I highly recommend it.