I've just added a RSS feed for Jakarta Cactus news. It is available at http://jakarta.apache.org/cactus/news.rdf.

The update process is quite nice too: we change the RDF file in CVS. Then every night Gump builds the Cactus project documentation (we transform the RDF file to HTML using XSLT in this process) and if the build is successful, upload it to http://jakarta.apache.org/cactus. Thus we get automated updates from CVS to your RSS feed reader!