Although they often duplicate functionality, in the interest of fairness, I will list all the ones I know about here. We have essays on the applications and history of AI for those unfamiliar, to essays on programming and philosophy, all the way to full blown mathematically-orientated essays on genetic algorithms and neural networks. Generation5 prides itself also in its interviews sections with exclusive interviews from top AI scientists like Marvin Minsky, Craig Reynolds, Roger Schank, Andre LaMothe and many others. Generation5 also has a comprehensive collection of original programs, all with source included. Demonstration programs like image recognizors, number recognizors, cellular automata creators, NLP demonstrator and more.
All programs have an accompanying essay describing the workings of the programs.
The aim of Generation5 is not only to educate the viewer, but to allow the viewer to contribute to further other people's knowledge. Yahoo maintains a number of AI clubs. Interesting because it had to take some AI to build the engine.