Free video and audio lectures from MIT
Ok, I’ve mentioned before how MIT has this OpenCourseWare program, whose goal it is "to make the courses materials that are used in the teaching of almost all the undergraduate and graduate subjects taught at MIT available on the Web, free of charge, to any user, anywhere in the world." Well, now they have video and audio files of lectures for a number of courses, including:
Animal Behavior
Electromagnetics and Applications
Nano-to-Macro Transport Processes
More audio/visual courses at MIT OpenCourseWare