Colors, by Matt Patenaude
Colors is a simple application for graphic designers, web designers, and anyone else who needs to be able to pull colors from what you can see on the screen. Colors takes Apple's basic color chooser (complete with "magnifying glass" to pull colors from other applications), and combines it with an easy way to copy common formats of color values (eg., #rrggbb, rgba(r, g, b, a), etc.) to the clipboard. In the newest version, you can even define your own patterns, and input colors using any valid CSS color declaration. Colors is a free download for anyone who would like to use it. Requires Mac OS X 10.5 (Leopard).