He's not only a phenomenal teacher, but also an extremely nice guy. I had him as a recitation instructor (imagine that -- Walter Lewin teaching a freshman physics section, rather than being the main lecturer!) and for years after, he would e-mail the people from our section about interesting physics news, meteor showers, and the like.
When I took electricity and magnetism I was on the rocks at E school. I decided that rather than learn the material I would memorize problems to pass tests and save time. I ended up doing very well in the class but I didn't learn a thing. So a few months ago I started watching Lewin on iTunes U. He is everything that is right about a teacher. Passionate, engaged and focused on imparting the general concepts before the details. It's been a real (and free) pleasure watching him.
I just watched one of the videos and wow, he is a pretty awesome teacher. I generally can't stand studying physical sciences, but I'd be very interested in watching more of his lecturers.
