This is a very interesting website: TED. A collection of interesting talks, all of them downloadable and in the public domain (CC license). There isn’t much on physics yet, and certainly not in my area. There is a very nice talk, though, by Steven Strogatz on synchronization. Strogatz is a remarkable speaker, I had the pleasure of attending a set of lectures on “living polymers” that were very interesting, and I remember he used some of this examples on his introduction. Some of his demonstrations are quite ingenuous, and not so difficult to reproduce.
Er, I forgot to embed the video in the first version of this entry, which is funny since I came across this site from a wordpress announce. There it goes: