The following links are just sites I enjoy.  I'm not receiving booze or anything from them in exchange for a banner on my site.  I will add more as they are discovered.

Color Sites:
 

Color Matters - Approaches the importance of color from different angles, including
psychology, physiology, philosophy, and art.
 

Colorspeak is an experiment to explore how we perceive and associate the colors of the so-called safe palette with words, sounds, people, emotions, and events in our own experience.

Color Psychology - Research on the psychological effects of color.