Its nice to see that MS has finally concluded that AJAX is a technology that is worthy of getting frameworktized into the .NET Framework :-)
If you don’t want to wait for “Atlas” and you need to use this technology in .NET Framework 1.1 I would like to suggest Ajax.NET written by Michael Schwartz.
It’s well designed and written piece of software which is now even open sourced (Thanks Michael!).
I’m sure MS will borrow a few things from it for “Atlas”.