Build your own Feedbruner Leslie Orchard over at 0xDECAFBAD is busy building an Atom/RSS client/server aggregator on top of Mark Pilgrim's Universal Feed Parser. From the system diagram, it looks like the scanned feeds are dumped into your choice of relational database. From there you can construct queries for feed items, and then the query result set is automatically turned into an Atom feed. It goes one step further by providing an XSLT processor to transform the resulting Atom feed into XHTML for viewing inside of the browser. This is hardly revolutionary, but if done right it could become very useful. With some slight modifications, you could pretty much duplicate a lot of the functionality offered by .