ColorPix is a useful little color picker that grabs the pixel under your mouse and transforms it into a number of different color formats.
You can use the built-in magnifier to zoom in on your screen, click on a color value to copy it directly to the clipboard, and even keep ColorPix on top of all other apps and out of the way.
Download link : http://www.colorschemer.com/download.php
Platforms : Windows 2000/XP/Vista/7, Mac
File Size :605KB