I hold a session at MSDN Live in Sweden for some weeks ago. The slides are now availbable.

The tips in my slides are a collection of what I have seen several of people don't think about when they use ASP.Net Ajax, or have used the technology in a wrong way etc. It's gathered from different communities. I have also some hidden slides for the people who want to learn more about how to do Object-Oriented Programming with Inheritance etc by using the ASP.Net AJAX Library.

You can download the slide from here. (The language I used in the slide is English)