A mindmap that I created while reading "The Design of Everyday Things" by Donald A. Norman. All the key ideas about design for use and usability are in that cornerstone book. I complemented this diagram a little with other things I read about the topic.
ColorImpact is an award winning tool for creating harmonious color schemes. The program is based on the color wheel used by artists for centuries. With its intuitive and visual user interface, you can demonstrate color theory in action. ColorImpact is aimed at professional multimedia and web designers, and yet is simple enough to be used by beginners.