Bell's Theorem - An overview of Bell's Theorem and its applications in quantum mechanics.
Bell's Theorem - Another description of Bell's Solution to the EPR Paradoxon.
Bell's Theorem - A description of Bell's Theorem for laymen in the form of a game.
Einstein-Podolsky-Rosen Experiment - A simple overview of the EPR thought experiment which was thought to contradict Heisenberg's uncertainty principle
The EPR Experiment - A somewhat technical review of the EPR paradox and the Aspect experiment which was designed to test it.
EPR Paradox - Another site describing the EPR Paradox.
Schroedinger's Cation - An old Scientific American article including an outline of the infamous Schroedinger's Cat experiment.