I found a good post from Max Kiesler and want to share it.
http://www.maxkiesler.com/index.php/weblog/comments/60_more_helpful_ajax_tutorials/
Best regards
Mostafa Anoosheh
http://www.maxkiesler.com/index.php/weblog/comments/60_more_helpful_ajax_tutorials/
Best regards
Mostafa Anoosheh