This is a very versatile plugin. On our site, we use it for a main RSS feed and then we have rewrite rules setup to produce feeds for the newest links in each category e.g.
Code:
RewriteRule rss.xml /cgi-bin/search.cgi?query=;sb=ID;so=DESC;xml_feed=1
RewriteRule catname1_rss.xml /cgi-bin/search.cgi?query=;sb=ID;so=DESC;catid=1;xml_feed=1
RewriteRule catname2_rss.xml /cgi-bin/search.cgi?query=;sb=ID;so=DESC;catid=2;xml_feed=1
Then we add these URLs into FeedBurner to tidy up the feed URLs and track the subscribers.