Paint Cafe
Everything you always wanted to know about colour: its vocabulary, symbolism and psychological effects. There is also a great Colour Game to help you discover your colour preferences.
Taubmans 603010
603010 is a wonderful colour combination system. Each inspiration theme reflects different personalities and also includes a set of 10 Palettes that are designed to provide optimum balance of colours using the 603010 design rule. This site also has a colour profiler game.