http://www.ajax.ca/en/doingbusinessinajax/downtownajaxabout.asp

http://www.softpedia.com/get/Programming/Components-Libraries/AJAX-Control-Toolkit.shtml

http://sourceforge.net/directory/formats-and-protocols/protocols/ajax/os:windows/freshness:recently-updated/

http://www.microsoft.com/en-us/download/details.aspx?id=883