TechEd 2004, second day
The second day at TechEd I followed 2 sessions about ASP.NET 2.0 where the speaker demonstrated a lot of nice new controls and features. One of the features I like most (call it a feature or a bug-fix), is that the designer does NOT mess your aspx code anymore, which is a very good thing, I think it was called 'HTML preserve'. Features like, themes/skins, a tool for deploying your web application, role based management, navigation control, a bunch of login related controls (registration, login, lost your password, etc.), ...
After that there was the Belgian Day which was very well organized and was really fun (I don't have to mention that a lot of people watched the football :)