Finally. NPR has been providing almost all their content online for quite a while.
First you can watch Charlie Rose ... for free! (It use to cost 1$ a show, now you can watch the last week no charge.)
Now NOVA has some videos. Great!
Then if you want more see John Hogan (The End of Science) and science writer George Johnson talk about the Greene/Krauss debate on string theory they are on Bloggingheads.tv.