FeedTagger that allows you to "tag" your feeds under different headings. FeedTagger is really fast because it was built using a new technology called AJAX (short for asynchronous JavaScript and XML). I believe that AJAX is going to revolutionize the Web. Some of the most innovative web applications released in the last few months - Google Maps, Flickr, Gmail, Backpack, Tiddlywiki and now FeedTagger - all were built using AJAX.