MIT Physics Professor Walter Lewis "All of you have now lost your virginity... in Physics!" (interview)

Here you have a set of 3 videos showing how MIT Professor Walter Lewin use to give his lessons.
All of them are in English with subtitles in Spanish.
The first one is an interview where he explains his methods and the other ones  are  lessons about  measurement of  space and time

Interview
Measurement of space and time





There are some more examples uploaded in You Tube, just have a look.

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Sangakoo, a collaborative learning network that helps you learn math
 They say :" Sangakoo allows you to set up a virtual classroom to supervise your students, their exercises and progress"
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Available in Catalan and Spanish too