Principles of Lighting and Rendering with John Carmack

There's a few more options if you watch this via the twitch url (pop out window etc).

http://www.twitch.tv/bethesda

Just be sure to close the chat window, because even briefly catching some of the twitch chat will lower your IQ (if not will to live).

Also, the VOD will be viewable from that link for those who miss it live.