Seminal article which popularized "AJAX" as a term.

A directory of sites, books, and events about Asynchronous JavaScript and XMLHTTP, as well as sites using AJAX.

A wiki with principles, gotchas, frameworks, and common techniques. Also the homepage for the "Ajax Design Patterns" book.

Documentation and downloads for an AJAX library that uses .NET for the backend.

Tutorial article about AJAX, including a discussion about usability.

A Java open source library which helps developers wanting to write web sites that include AJAX technology.

Introduction and documentation from Apple Developer Connection.

Detailed tutorial that explains how to creating an AJAX ZIP code database including a PHP/MySQL backend.

Curt Hibbs demonstrates the use of Ajax within Ruby on Rails applications.

Provides class-style OO and Ajax, freely distributable under the terms of an MIT-style license.

An open source XMLHTTPRequest toolkit with PHP, Perl, and Python backends.

A collection of JavaScript libraries that help web developers add AJAX functionally to projects.

A blog with code snippets and proofs of concept.