The Yahoo! User Interface (YUI) Library is a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML, and AJAX. The library sits comfortably amongst its peers, which, amongst many others, include Prototype, jQuery and Mootools. Arguably it can be said that the YUI library is the king among the JavaScript and CSS-libraries. With a vast number of well documented examples and near 100% compatibility amongst modern browsers, it would be difficult to find a comparable library. Read more – ‘Learning the Yahoo! User Interface Library – Book Review’.
Asynchronous JavaScript and XML. It's a whole new way of looking at the web where HTML page makes asynchronous calls to the server using JavaScript and loads the data in bits and pieces as needed. Ajax is not a new technology. It’s a new developing approach, based on the following existing technologies: XHTML, CSS, DOM, XML, XSLT and XMLHttpRequest. Read more – ‘Coldfusion AJAX Frameworks’.