"FeedYes.com gives rss feeds to every page on the web."
If you want an rss feed from a site that doesn't have one, like userscripts.org, feedyes will generate one for you. The last link in every feedyes rss is always "More information", which is an advertising link to feedyes. This removes that link.
If you would like an rss feed for userscripts.org you can use mine without creating your own account -
http://www.feedyes.com/feed.php?f=tL22XBt4cIxQV7iB. EDIT: This link no longer works!
The second line in this style removes the "read more" warning from userscripts.org, which you don't need in an rss feed. You can remove this line and the leading comma if you don't want to use my userscripts.org feed.