How British are you?
Imagine the day, though still a year or two away, on your return to your home town, the first question you get to be asked is probably, "so, what do you make of Great Britain?".
Talks speeches podcast etc...
http://dolectures.com/
http://99u.com/videos
http://www.feastongood.com/conference/past-speakers/ (use Vimeo)
http://www.thersa.org/events/video
http://www.youtube.com/user/AtGoogleTalks
http://www.khanacademy.org/ (amateur videos, audio quality not topnotch)
http://www.academicearth.org/ (a bit like uni lecture recap)
Academic Earth aims to provide everyone with the opportunity to earn a world-class education by offering free online classes and online learning tools.
http://topdocumentaryfilms.com/all/ (documentaries collected on the internet I think)
http://edge.org/videos (with transcript, but can be too specialised)