Basics of Color Theory Elementary color theory with short descriptions of many terms. Color A site with nice design. Has good information and resources. Color Theory Resources Reviews of books on color from quilters at Prairienet. All the major texts are cited.
Early sections are interesting but it moves into some heavy math.
Poynton's Colour FAQ Aspects of color specification and image coding for digital imaging people. An incredible list of art history links by period and culture maintained by Prof. Chris Witcombe of Sweet Briar College on behalf of Harcourt Brace College Publishing in connection with Gardner's A Histrory of Art . Very strong organization of links by period and style. The History of Art Virtual Library A LOT of links. Despite the title of this site its actually a great resource, good presentation of excellent scans of works by the great painters in history.