Ten Things About Colors and Color Codes
1. Get the lowdown on color hue, chromaticity, saturation, value and luminance at Colorcube.com's Advanced Color Theory.
2. Colormatters.com's Color Theory page explains basic color and color harmony.
3. ITA's Complete HTML Color Chart.
4. Get hex codes as well as a look at page layouts at Color Scheme Generator 2.
5. Generate your own virtual paint chips at Color Schemer Online.
6. Jeff Minard's Online Color Palette Generator picks a palette of complimentary colors for any image you upload.
7. Website Wisdom has a simple web page generator that will generate html code for you based on your preferences.
8. December.com offers The Color Spot at HTML Station, which includes a very neat Hex Hub to help you code your colors.
9. For those who are afraid to ask, What is HTML explains the code, in simple language, with examples.
10. Scott Pamatat talks about the importance of color in web site design in his article Your Choice of Web Site Color.
(Most of the generator links were pinched from The Generator Blog.)