We've released RTM today and you can read all of the details at http://ajax.asp.net.    If you're migrating existing ASP.NET 2.0 applications to ASP.NET AJAX or are migrating an appliication created with the July CTP, or one of the ASP.NET AJAX Beta/RC releases, make sure you check the whitepaper and migration guides at http://ajax.asp.net/documentation/default.aspx?tabid=47.    The most important sections deal with changes you'll need to make to web.config to configure the application properly for ASP.NET AJAX.

 Here are a few additional details about ASP.NET AJAX that you may have missed:

• ASP.NET AJAX 1.0 and the Microsoft AJAX Library are provided with full product support, meaning that if you run into any problem with ASP.NET AJAX that affects your business, you can get service through Microsoft support on a 24x7 basis.   This means that you can use and deploy ASP.NET AJAX just as confidently as you would use anything else in the .NET Framework.   ASP.NET AJAX 1.0 is also considered by Microsoft to be officially part of the .NET Framework.
  
• If you're an ISV deploying applications using ASP.NET AJAX, you're permitted to redistribute ASP.NET 2.0 AJAX Extensions 1.0 with your application in the form of the installer (ASPAJAXExtSetup.msi) that you can deploy and run with your application's installer.   Check the release notes for details on how to install in silent mode.
  
• The license for the Microsoft AJAX Library has been updated for RTM and essentially allows developers to use, modify, and redistribute changes to the JavaScript library files in accordance with the license terms provided with the library.   Note that if you modify and redistribute your own versions of the files, you must use your own unique namespace.

 I'm VERY excited about the release and about what happens next with ASP.NET AJAX as it now moves into mainstream production use.

 -Rich