Other
Reading Schematic Diagrams
This personal site provides a good basic overview of how to reach schematic drawings.
Ducksters
Ducksters: Physics for Kids: Electronic Circuits
Kids learn about electronic circuits in the science of electricity and physics including schematics, power, ground, components, and the printed circuit board.
Other
Gm Arts: The Electric Guitar
A brief page from GM Arts which includes what makes a guitar's sound unique, a list of great players, and schematics.