Mastering Ajax, Part 2: Make asynchronous requests with JavaScript and Ajax

Part 2 goes into more depth on using XMLHttpRequest. It details some basic uses like error handling and call backs. Nice article.

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Mastering Ajax, Part 1: Introduction to Ajax

Yet another excellent Developer Works article. A nice intro to Ajax. Covers the basics of using the XMLHttpRequest object, including cross browser issues.

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Another nice Python Tutorial

Nice tutorial. The color scheme is not so hot though.

Discover Python

There is a nice set of introductory Python articles over on Developer works.