This is certainly cool.  I’m stoked about the ASP.NET AJAX release in general, but the source code too?  Even better.

From Scott Guthrie’s blog:

The client-side ASP.NET AJAX JavaScript library (which we also call the “Microsoft AJAX Library”) is being released under the Microsoft Permissive License (Ms-PL).  This grants developers the right to freely customize/modify the library, as well as to redistribute the derivative versions of the JavaScript library for both commercial and non-commercial purposes. 

. . .

The code for the server-side ASP.NET AJAX 1.0 implementation was released this morning.  You can download it here.  It is being released under the Microsoft Reference License (Ms-RL). 

. . .

You can also obviously download (and modify) the source code for the ASP.NET AJAX Control Toolkit.  It is built as a collaborative CodePlex Project that both Microsoft and non-Microsoft developers contribute code and work on together.

Thanks, Scott!