The new version of Atlas, now called ASP.NET AJAX, has been released.  They have changed all of their marketing and naming to ASP.NET AJAX instead of Atlas.  There are several downloads to it.  The first download is the ASP.NET 2.0 AJAX Extensions which contains both the Microsoft client side library and the ASP.NET extensions for the server side items.  The client side library can be used independent of ASP.NET and contains several useful javascript functions.

The second download is called the ASP.NET 2.0 CTP which contains features that may or may not be included in the final release of ASP.NET AJAX.

I will be looking at these as I build the Morale web application.  I already need to replace some of the AJAX functionality in the sign up page of Morale and I will report what was involved in that.

You can get all the downloads here.

UPDATE: There is a third download.  One that contains the toolkit based on the new AJAX libraries.  You can get it here.