A talk on Ajax - a better way for clients to interact with a server.

VOIP tester used in the talk;
supremeit.com/voip/dialplan.php

Wikipedia definitioin;
http://en.wikipedia.org/wiki/Ajax_(programming)

Some links to aritcles on AJAX
http://developer.mozilla.org/en/docs/AJAX:Getting_Started
http://www.adaptivepath.com/publications/essays/archives/000385.php
http://www.sitepoint.com/article/build-your-own-ajax-web-appsa

Site demonstrating some of the things you can do with css;
http://www.csszengarden.com/