Atomic Theory
Atomic Theory Overview - from the University of Oregon
Atomic Theories and Exercises - from Click and Learn
Quantum Theory
The Double Slit Experiement Video
The Double Slit Experiment Interactive
Schrodinger's Cat - from Engines of Our Ingenuity
Periodic Table of the Elements
Interactive Periodic Table
Forces & Energy
The Physics Classroom - a comprehensive online physics tutorial. See chapter on Static Electricity. I recommend browsing, too.
Gravity FAQs - from the Astronomy Cafe
Inspiration for "the Machine"
Newton's Laws Video Demonstrations from Wake Forest University (Check out links at top of page for other demo videos!)
Can We Top This? http://www.youtube.com/watch?v=RouXygRcRC4