As Duncan mentions, the C# TechEd 2004 page is up. Make sure to catch Anders' presentation on new features (DEV321)! I'm sure it'd be easier to follow with the audio/video feed, but the presentation covers the new features nicely.
I was thinking about covering List<T>'s FindAll and RemoveAll methods (using anonymous delegates, even!) since modifying a collection while iterating over it isn't allowed, but Anders does so with some good demonstrations in the presentation.