TubeNinja
Example url: http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-041-probabilistic-systems-analysis-and-applied-probability-fall-2010/video-lectures/lecture-7-multiple-variables-expectations-independence/
mit.edu is an edu site that features tons of videos for your pleasure.
mit.edu is the 513th most popular webpage in the world according to Alexa rank.
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