http://streamer.perimeterinstitute.ca:81/MediasiteLive30/LiveViewer/FrontEnd/Front.aspx?cid=11c6ed02-c9d9-4be4-961b-a8085fc24e07 I've listened to a few of these physics lectures from the Perimeter Institute, and some have been quite interesting. I started with the one about Galileo, thinking that wouldn't be technical. I was right, and I learned some things. Then I took in the one on solar systems, and pictoral "proofs" in math. If any got slightly boring I just moved it along with the cursor.
I would recommend for people interested in science, who like listening to lectures, and who have decent headphones. It would be a challenge to hear with generic crappy computer speakers.