I just came across an article that very clearly introduces AJAX: An Introduction To Ajax
Recently I did an internal presentation Enhancing Web Applications with AJAX, XMLHttpRequest, UIX – Report from An AMIS Ten Minute TechTalk and of course I thought I did a very good job. However, this article takes it to the next level – so I really recommend it, if you want to get up to speed with this whole ‘AJAX’ thing. Some clues about (D)HTML, Http Requests and JavaScript are more or less required.
Another useful article, by SUN: https://bpcatalog.dev.java.net/nonav/ajax/ajax.html which happens to be the same one as http://java.sun.com/developer/technicalArticles/J2EE/AJAX/.
Indeed, a great article , thanks for pointing it out.