I did some hands on labs on ASP.NET 2.0 and attended a session about asynchronous pages in ASP.NET 2.0. Dmitry (the speaker) showed various different methods on how to implement asynchronous pages: parallel, serial, with and without timeout... It was really a great session full of useful information! Dmitry also published the sample code used in the session on his blog.
Later I attended a session about common hacking techniques used against web sites and how to harden your sites against these techniques using ASP.NET. Although I have seen similar sessions before there were some additional flavors - especially for cross-site-scripting which I haven't been aware of.
After this session I met a couple of european MCMS developers who wanted to talk with me about MCMS problems they experienced in their projects.