In web development, Comet is a neologism to describe a web application model in which a long-held HTTP request allows a web server to push data to a browser, without the browser explicitly requesting it. Comet is an umbrella term for multiple techniques for achieving this interaction. All these methods rely on features included by default in browsers, such as Javascript, rather than on non-default plugins.
Chrysalis is a modern looking theme which supports the Asynchronous module.
Online Ruby Tutorial/Parser
With the AJAX Language API, you can translate and detect the language of blocks of text within a webpage using only Javascript.
Javascript Tools provides a common set of methods extending those available in Drupal core (drupal.js) for Javascript and AJAX module development in Drupal.
VideoDL is a quick AJAX application which allows you to download online video into your computer. It supports top 3 video sites - YouTube, Google Video, and Break.com.