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From the site "Check out these 25 hand-picked Ajax articles and tutorials that outline various methods and concepts involved in the development of Ajax-based applications."
For the most part I find AJAX useless mainly for the fact that it's not SEO friendly and it's not accessible content. If you're not using it to drive the main content of your website, then I think it's acceptable in small amounts. Web applications have the greatest use for it.
By: Neal Grosskopf