On our sister site, AjaxDeveloper.org, today there's a new post with information about creating your own RSS aggregator with the help of PHP and Ajax.

Imagine using a simple HTML file to send a request to a server-side script, receive a custom XML file based on that request, and then display it to the user without ever refreshing the browser! Kris Hadlock explains how to use a combination of PHP and AJAX to create real-time data transfers in any application without a browser refresh.

They (obviously) require some knowledge from the developer of PHP and Javascript, but other than that, they pretty much give you all the code you'll need...