MIT OpenCourseWare is a text-based site. The materials we’ve collected from over 2,150 MIT courses come to us largely as documents which we post in PDF format. We do, however, have a significant collection of video an audio lectures on our site—more than 100 courses include some video or audio content—but these resources often get lost in our huge library.
You may not be aware that there is a really easy way to find them: our Audio/Video Lectures page. This page presents all of these courses in one list, organized by department. It’s a great resource for the fans of top notch recorded lectures.