1)   SI ColorPicker 1.0
Pick pixel colors as HTML, HEX or RGB values. Drag the eyedropper tool onto a picture or anything else on your desktop, and SI ColorPicker will display the exact value of that pixel in a number of formats from HTML to RGB.

 2)   GetColor! - Color Picker 1.01
GetColor! allows you to retrieve the color of any pixel on your desktop easily: just move the eyedropper tool into any place of your desktop and GetColor! will show you the color value!