Microsoft Ajax RTMed
Finally, this long awaited day has arrived! Microsoft Ajax Library has RTMed! Do go to http://ajax.asp.net to get the latest bits.
Ajax 1.0 contains all the stable code base. while an additional add-on contains features that are still under development. :)
Read the complete post at http://darrensim.com/blogs/techbits/archive/2007/01/26/microsoft-ajax-rtmed.aspx