Reverse Ajax, Part 2: WebSockets - A powerful solution (despite some server constraints)

Reverse Ajax, Part 1: Introduction to Comet - Streaming and long polling for responsive communication between your server and client

60 More AJAX- and Javascript Solutions For Professional Coding

Ajax Upload; A file upload script with progress-bar, drag-and-drop

Ajax user authentication and registration techniques with jQuery

Using Ext.Direct in Ajax applications

Using Ajax with Web services

http://www.ibm.com/developerworks/web/library/wa-aj-webservices/

xslt.js

http://johannburkard.de/software/xsltjs/

xslt.js is a tiny (less than 2 KB) JavaScript library that lets you asynchronously transform XMLwith XSLT on the client. Why transform XML on the server when the client can do it, too?

In Microsoft Internet Explorer, no instantiation of ActiveX controls are necessary, so xslt.js works nicely in companies where admins have deployed “hardened” versions of IE that cannot instantiate any ActiveX controls.

xslt.js includes a jQuery plugin and the ability to use inline XML.

Build a dynamic organization tree using GWT and RESTful Web services