"Get outta my jungle."
I just discovered that Latricia updated the XML::Feed CPAN module to merge RSS/ATOM feeds into one ATOM feed. This is awesome! I had a similar idea for AJAX Tagger 2.0, where I wanted to offer a combined feed of all tagged results. If this module works as advertised, I can use it directly instead of building my own tool. This might be a better solution than my initial plan of using OPML.