If you're interested in Microsoft Web technologies then this is for you, the sessions from Microsoft's annual Web conference held in Las Vegas are now online at http://sessions.visitmix.com/. There's lots of cool content available including presentations on Internet Explorer 8, Silverlight 2 and Surface.
One of the stand out videos for me is the second keynote which is an interview with Steve Ballmer given by Guy Kawasaki. Guy was an original employee of Apple responsible for some of their early marketing campaigns and is often credited for bringing the concept of evangelism to the tech industry, he is now a well known Silicon Valley venture capitalist. As you can imagine Guy does not give Steve an easy run for his money and the interview is both interesting whilst remaining fairly light hearted. You can watch this keynote session here.