Microsoft’s investing in CDN for a lot of their ajax scripts and also jQuery, we already knew that for a while. Now they also added support for SSL so when you use your site with https it shouldn’t give an enduser the warning anymore about mixed content. The very well known “This page contains both secure and nonsecure items” message.
There’s a whole list available out there: http://www.asp.net/ajaxlibrary/cdn.ashx.
At first I didn’t see the dataservice.js scripts anymore, the ones that enable people to use ajax against ADO.NET Data Services, I mean WCF Data Services after the product got renamed, but they also got renamed to: http://ajax.microsoft.com/ajax/beta/0911/MicrosoftAjaxAdoNet.debug.js http://ajax.microsoft.com/ajax/beta/0911/MicrosoftAjaxAdoNet.js
Besides the new CDN SSL feature there’s also a new Library available for Microsoft Ajax. Also quite a lot of new tutorials have been added for the new Ajax library.