Ever wondered how artists and designers master the art of light and shadow...how they seem to know when to use a drop shadow, when to use a cast shadow and when to use highlights? And what about light sources? How do you figure all this out to create pleasing designs?
I first learned about light and shadow in a drawing class I took eons ago. The principles are still the same, though. My favorite online resource, Smashing Magazine, has an informative post on this subject.
Learn and enjoy!