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).
Learn AI via Spreadsheet
2 hours ago