Sites

The Laymans Guide to Probability (Popularity: )
http://www.probabilitytheory.info/
An in-depth but easily readable guide on probability theory, covering various aspects of theory with a bias to gambling games.

Probabilistic Learning Activities Network (Popularity: )
http://www.planetqhe.com/
Probability activities and simulations in the form of applets and spreadsheets. This site advocates a Question/Hypothesis/Experiment approach to learning probability.

Applied Probability Society (Popularity: )
http://appliedprob.society.informs.org/
A subdivision of the Institute for Operations Research and the Management Sciences (INFORMS) concerned with the application of probability theory to systems that involve random phenomena.