I spend a lot of time working on the computer, and sometimes it can be a bit boring. So, I like to have something on in the background while I work. I just found the motherload of awesome documentaries at National Geographic Channel's video page:[link]
This link is to over 200 full-length videos--whole episodes, not clips! They're really great to watch while you work because the narration tells you what's going on, so you can tell what's happening without having to see it. Right now, I'm watching Madness of Henry VIII. Come on down and get your learn on!