As promised, here is the first in a series of short screencasts about specific ASP.NET "Atlas" capabilities. Channel 9 description:
"Microsoft Federal Developer Evangelist Marc Schweigert demonstrates the fundamentals of the "server-centric" approach to AJAX enabling ASP.NET pages using "Atlas." You'll see how easy it is to AJAX enable a page without writing a line of client side script while leveraging the ASP.NET server control programming model ASP.NET developers are already familiar."
This screencast is available here.