http://atlas.asp.net/docs/Server/Microsoft.Web.UI/ScriptManager/Declarative Syntax.aspx
Documentation on the ScriptManager control
http://msdn.microsoft.com/msdnmag/issues/06/07/AtlasAtLast/default.aspx
A quick overview of Atlas by an ASP.NET team development manager
http://weblogs.asp.net/atlas
The blog for official Atlas announcements