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University lectures available online from all over the world, including MIT, Harvard, etc. Not necessarily great lectures all the time, but great sources of information and sometimes great examples of lecture done well.

MIT Open Courseware. A great way for students to access material that may not be presented at their level anywhere else. For that matter a great place for teachers to brush up and expand their thinking. I spent about an hour on the combinatorics course developed by an MIT student for high school math students who are 'bored' by high school math classes. If you are interested, it pushed my understanding pretty quickly!