http://ajax.asp.net
http://ajaxian.com
http://ajaxmatters.com
http://developer.mozilla.org/en/AJAX
http://developer.yahoo.com/yui/
http://dojotoolkit.org
http://jquery.com
http://mochikit.com
http://mootools.net
http://openjs.com
http://prototypejs.org
http://sourceforge.net/projects/clean-ajax
http://w3schools.com/Ajax/