The Psychology of Color- Ever wonder what your favorite colors say about you? Why if you pick one shade of green over another it can totally change the feel of a room? The psychology of color is here to help. If you are going for a certain feel for a room, you can choose coordinating colors in the thoughts you want to evoke. Have a job interview? Pick an outfit or accessories in colors that show what you want to say about yourself. Enjoy!
I like this particular chart of the emotional, physical, and behavioral effects of different colors, but the whole post is one of the best explanations of color I've seen. Explanations here for primary, secondary, and tertiary colors, as well as complementary, analogous, triadic, and warm/cool colors.