Wikimedia
Wikipedia: Van De Graaff Generator
A Wikipedia description of how a Van de Graaff generator works.
Other
Rhic Virtual Tour
Virtual tour takes you through the Relativistic Heavy Ion Collider. The first stop is the Tandem Van de Graff accelerator.
University of Kentucky
University of Kentucky: Van De Graff Generator
Provides the physics behind a Van de Graaff generator at an introductory high school level.
National High Magnetic Field Laboratory
Magnet Academy: Electrostatic Repulsion in Van De Graaff Bubbles
A fun look at how Van de Graaff generators illustrate electrostatic forces. (Java tutorial)
University of Wisconsin
University of Wisconsin: 4 Electricity
A description of several demonstrations for static electricity concepts. The demonstrations utilizing the Telsa coil, Faraday cage, and Van de Graaff generator are ideal for demonstrating electric potential concepts. Suitable for student...