--A Hands On Guide for Artists, Scientists, Hobbyists (and Engineers in a Hurry).
the full story in convenient book form...
....or a just a Quick Reference Basic Stamp, BX24, Basic Atom, PIC.
Perhaps you are a sculptor who would like different sounds or videos to play based on how someone touches your sculpture, or a dancer who wants a knee bend to cause bells to ring. Maybe you are a sociologist who needs to log how many people pass a street corner. Or maybe you just want your window blinds to be automatically lowered in the afternoon if it's hot outside. Regardless of your background or technical experience, this site is designed to help make a more interesting connection between the physical world and the computer world.
Tom Igoe is the area head for Physical Computing at New York University and I highly recommend his site.