ColorZilla has long been a tool in the web developer/designer chest. Even if you have tried and discarded it before you should check out the new version. It includes a DOM Color Analyzer. This traverses the DOM of the current page and returns a palette of used colours. This is useful for learning from well designed sites and also useful on your own sites. You can check colour consistency, simplify your palette and quickly get at colours you’d normally have to hunt through a CSS file for.
Nice feature guys.

