AI space has a nice set of introductory javascript applets to a number of AI learning techniques. It covers graph searching, Belief and Decision Networks, Decision Trees, Constraint satisfaction problems, Neural Networks and more. It is a more 'traditional' AI site.
I also came across this great SLAM visualization tool for Player. A valuable resource on this is the Robotic Mapping and Exploration book (Springer Tracts in Advanced Robotics).
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