SuperCat can return feeds of recently edited or created authority and bibliographic records:
http://<hostname>/opac/extras/feed/freshmeat/<feed-type>/<record-type>/<import-or-edit>/<limit>/<date>
Note the following features:
Example: http://gapines.org/opac/extras/feed/freshmeat/atom/biblio/import/10/2008-01-01
You can generate a similar list, with the added ability to limit by Org Unit, using the item-age browse axis.
To produce an RSS feed by item date rather than bib date, and to restrict it to a particular system within a consortium:
Example: http://gapines.org/opac/extras/browse/atom/item-age/ARL-BOG/1/10
Note the following:
Modifying the atom portion of the URL to atom-full will include catalog links in the results:
Example: http://gapines.org/opac/extras/browse/atom-full/item-age/ARL-BOG/1/10
Modifying the atom portion of the URL to html-full will produce an HTML page that is minimally formatted:
Example: http://gapines.org/opac/extras/browse/html-full/item-age/ARL-BOG/1/10