Two of the subjects that I have posted about in the past come together here. The Omnificent English Dictionary In Limerick Form (better known as the OEDILF) has added an RSS feed at http://www-b.oedilf.com/db/rss.xml that will deliver to your news aggregator the latest limericks added to the site's database.
If you don't already use an aggregator, one of the best is Nick Bradbury's FeedDemon, as I have said here before at length.