Don’t be intimidated by the words, Apple Script. The whole tutorial is only about 3 steps, and John gives you the script to copy/paste, so it’s real easy.
ThisService is an app for adding custom items to the Services menu found in OS X (10.4 only???), and it’s free, although donations are welcome. While you’re there, check out Waffle’s, Hex Color Picker. It allows you to add an extra tab in the system-wide color panel, so you can instantly see the hex color code for any color.