On the Ergo/Gero human factors site, an SBFAQ -- "Should Be Frequently Asked Questions" -- on color and its use in design. No time to read now, just noting for later.

    this SBFAQ is intended to fill a gap between the highly technical aspects of color and design. It consists of 6 parts. The first two cover questions about basic color psychophysics and the third covers color appearance and perception. (Perception and psychophysics are very different fields.) The following set of questions explains "color blindness" and the last two sets deal directly with effective use of color in design.

Culled from SIG-IA.