LibWorm is a search engine that allows you to search the RSS feeds of over 1,000 library related blogs. It collects updates from the feeds, the contents of these feeds are then available for you to search, and your search results can themselves be output as an RSS feed that you can subscribe to either in your favorite aggregator or in LibWorm's built-in aggregator. It also allows you to browse feeds by feed category (each feed searched by LibWorm is assigned a category) or by subject (pre-built searches for common subjects relevant to libraries). To submit your own feed to LibWorm, you have to first register for a free LibWorm account. Logging in will give you access to the "Submit a Feed" form.