Google Reader

Google Reader is an online web based utility that handles RSS feeds similar to the way Flickr handles pictures, or Del.icio.us handles bookmarks, and that is that it groups them all in one place for greater ease of use for the user.  

Google Reader also allows the user to share his/her RSS feeds with friends, add tags, and group them so that each addition to the feed is separate  but under one heading, like a type of "categorisation"