The estimable Magnar Sveen has, to use his words, come out of hibernation and continued the posting of his WebRebels talk. This video is part 5 of the series.
It's been a while so if you don't remember, the official video of the talk had technical problems but Sveen has recreated it bit by bit. If you've never seen Sveen talk, it's a real treat. He's an excellent speaker and his mastery of Emacs is impressive.
He's most known for his spectacular Emacs Rocks! videos. If you're an Emacs user and haven't watched them, stop right now and have a look. His original talk at the Oslo WebRebels is astounding and you should definitely watch it too. You can get links to the other videos for the current WebRebels talk at this page.
If you like these videos and want to learn a bit more about Sveen, Sacha Chua interviewed him in one of her Emacs Chats.