I am looking for a free web service similar to Change Detection or page2rss that can create an RSS/ATOM feed from any page that does not provide a feed by itself. I am asking for an alternative to Change Detection and page2rss because these two are not capable of distinguishing between minor and real changes on a page. That is, with these services I often get an RSS feed update even if just one number changes, the page date is updated or a few words are added.
Do you know of any other web service that handles the recognition of changes better?