The MSDN Nuggets website has just released a TON of awesome videos about new C# 3.0 features. Personally I love the stuff they are doing with the LINQ project. It's going to make the awesome C# 2.0 language even more powerful and flexible.
The site also released a cool video about how to get Vista's glass to work in your apps. By the way, if you're interested in the workflow foundation, there are a ton of videos on that as well.
Here are the videos...
}