Another solid shortcut from O'Reilly by Wei-Meng Lee - -check it
out    ASP.NET "Atlas" is a new developer framework from
Microsoft that simplifies the task of building more interactive
web pages by drawing on the power of the Ajax technologies found
in most modern browsers. Because of its tight integration with
ASP.NET 2.0, Atlas will be of particular interest to Microsoft
web developers. In this Short Cut, Microsoft MVP Wei-Meng Lee
introduces you to Atlas by showing ten ways you can use the
technology to improve the user experience of your existing
ASP.NET 2.0 apps. There's no better way to get acquainted with
Atlas than by diving into a project, so read on and let's get
started.