CIE.co.at/cie/. 'the International Commission on Illumination - abbreviated as CIE from its French title Commission Internationale de l'Eclairage - is an organization devoted to international cooperation and exchange of information among its member countries on all matters relating to the science and art of lighting.'
'Welcome to the CSS and web design workshop, the WellStyled Workshop. Enjoy all CSS, HTML or Javascript techniques, tricks and hacks you can find here.'
Webdesigners Tools. Very nice. See colors interactively using HSL, different common combinations (schemes), web-safe or not, and as viewed by different kinds of color blindness.
Color SynthAxis. 'color synthAxis is a free online tool designed to simplify the nightmare of color scheme selection. It looks complex, but after a few minutes you won't be able to live without it.'
Four color theorem. 'every possible geographical map can be colored using no more than four colors in such a way that no two adjacent regions receive the same color. Two regions are called adjacent if they share a border segment, not just a point.'
ColorMarketing.org . ' Color Marketing Group, founded in 1962, is a not-for-profit, international Association of 1,500 Color Designers involved in the use of color as it applies to the profitable marketing of goods and services. '
colourlovers.com. "a resource that monitors and influences color trends. COLOURlovers gives the people who use color - whether for ad campaigns, product design, or in architectural specification - a place to check out a world of color, compare color palettes, submit news and comments, and read color related articles and interviews."