Animated Engines - Animated pictures explain the inner workings of a variety of steam, stirling, and internal combustion engines. www.keveney.com/Engines.html
Simple Machines - Gives real-life examples of the six simple machines, plus an easy quiz, and links. www.mikids.com/Smachines.htm
The Secret Life Of Machines - Drawings and explanations to common machines and how they work. www.secretlifeofmachines.com
