Colortypist is a fun way to learn web color names - you can type in a color by its name or code, and then see it fill your entire screen, in real-time.
ColorCatcher is a lightweight, free color picker app that allows you to extract colors easily from your screen via the built-in magnifier to capture and identify colors precisely wherever you point it on your screen.
GetColor Color Eyedropper is a simple portable tool for quickly obtaining Hexadecimal or RGB values of any color on your PC, as well as the X and Y coordinates.
Color Warlock is a portable app to use color charts in a Color Warlock format to use to copy HTML hex color codes and other color types to use when coding.
CP1 is a simple and lightweight color picking/identification utility designed for copying and extracting HTML or RGB color formats right from the screen.