WP Hack: AjaxWp Enhance and adorn your WordPress blog with AJAX goodness. From the documentation that I could find on the site, it looks like AJAXWP will add AJAX functionality to your existing theme without any required modifications but you can get a lot more from the package by delving under the covers. The author’s blog is an example of AJAXWP’s capabilities.
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http://digg.com/design/An_AJAX.....ress_blogs