All regular sessions that were given at TechEd in San Diego are available in video and power point slides from http://microsoft.sitestream.com/teched2004/. I have watched\listened to a few sessions so far the two are standouts:

• ASP.NET: Best Practices for Managing and Operating IIS 6.0 and ASP.NET Solutions
• .NET Framework: Exploring What's New in the CLR 2.0

I will post any more that I see that are standouts.