So, it only took something silly like six months but I finally got a working example of Apache::XBEL.pm online. warning: you'll want a 5.0+ browser for this, kids. One of the things I'd like to do next, I write an as_XBEL widget for Simon Kittle's Text::Outline module so you can feed any old outline document and have exciting, foofy renderings complete with breadcrumbs and unique web "pages" for each node. The example linked to here was created with a very simple Perl script (included with the package) that slurps a variety of RSS feeds and generates an XBEL document. It would be trivial to turn the script into a mod_perl handler itself and have it filter the results to Apache::XBEL and, lo, YA-aggregator is born! Or you could just use your bookmarks...