Cornell University
Cornell University: Art, Design, and Visual Thinking: Color, Value, and Hue
Contains information on value, contrast, gradation, and the values of hues of colors. Has great color charts and links to related sites.
University of Saskatchewan (Canada)
University of Saskatchewan: Value & Color
Basic color theory is discussed in relaton to computer art applications. Illustrated.
Other
Guidance Communications: The Alphabet of Art
A site dedicated to providing vocabulary for the elements of visual design. Includes a visual notation system for describing both the elements and attributes of art.