Google's online feed reader now allows you to track changes on any page - even those that don't feature an RSS feed. Google will create its own custom feeds for these sites and update the feed whenever it notices a change. Google Reader will display a short snippet of the page changes in the RSS feed.
RSS/Atom feed tester Preview what your Atom or RSS feed will look like when imported into FriendFeed
Create an aggregation site which aggregates RSS feeds and outputs them in river of news style pages with the most recent news items first.
SimpleFeed - feed parsing the easy way :-)
drive rss-feed to deliver the full text...