Help For The Chromatically Challenged
Here are three of my favorite color work programs.
1) Pixel Toolbox:
This gem allows you to build one of those cool "favicon.ico" icons that you see in front of the url for the site you're visiting (like this one), in the location window of your browser.
Pick colors (or blend your own) and get the RGB values and even the HTML hex code for pasting into your web pages.
This one's my favorite. Fire it up and you instantly get the RGB and HTML hex codes for any color under your mouse pointer. Works with any application, even websites currently in your browser (allowing you to copy a favorite color scheme exactly).