"LibWorm Beta is intended to be a search engine, a professional development tool, and a current awareness tool for people who work in libraries or care about libraries. LibWorm collects updates from about 1400 RSS feeds (and growing). The contents of these feeds are then available for searching, and search results can themselves be output as an RSS feed that the user can subscribe to either in his/her favourite aggregator or in LibWorm's built-in aggregator...Each feed searched by LibWorm has been assigned a category, so when you browse by Feed Category, you're seeing all the content from the feeds that have been assigned to that category. Subjects are pre-built searches, usually of greater complexity than the user interface currently supports, for common subjects of interest to libraryfolk." This site is free.