Other
Gorp.com: Climbing Fundamentals
This resource discusses some history of rock climbing but primarily focuses on the basic fundamentals of safe climbing. The information provided is somewhat brief, but links are provided to additional information along with some pictures.
California Institute of Technology
Caltech: Rock Climbing Equipment and Techniques
This site from the California Institute of Technology provides a description of equipment that one needs for rock climbing. Very informative and worth checking out.