Easy as Pie Ajax Requests - Create compelling ajax in minutes with simple examples. | Notes from Phazm
This is a good straightforward hands-on explanation of Ajax: succinct and clear.
Link tags: xmlhttprequest
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AJAX Activity Indicators
Want to indicate that something is happening on a web page, like... oh, I don't know... an Ajax request or something? Here's a cornucopia of animated progress indicators.
perl.com: Using Ajax from Perl
My fellow Brightonian geek, Dom, has written an article about using Perl and Ajax.
For Many AJAX is Not Degrading, But it Must :: Off the Top :: vanderwal.net
"...it must degrade well. It must still be accessible. It must be usable. If not, it is a cool useless piece of rubbish for some or many people."
rest/ahah - Microformats
Who knew? The way I do my Ajax is a microformat. AHAH: Asynchronous HTML and HTTP.
Simon Bisson: Old dog learns new tricks
Ajax in The Guardian.
AJAX: Usable Interactivity with Remote Scripting
A nice introduction the XMLHttpRequest object by Cameron Adams.
Google Maps API Documentation
Documentation for the new Google Maps API. Unlike most web services, this one is run entirely over JavaScript.