Check out this “early release” of an extension of the Radio Userland world. From the developers’ about page:
This Tool extends the Radio Userland aggregator from rss to any networked data (xml, html, soap, personalized services, etc), and any layout. It is exceedingly simple for developers to add functionality to the framework. The GUI (screenshot) is reminiscent of My Yahoo! and other server based personalization tools.
More information available here.