Try this link on the Feedburner Web site.
The book support pages on my Web site include a link for readers to click to learn more about RSS. When I first set up that link, it went to a basic information page on the NewsGator Web site.
I’ve since decided to go with a link on a more objective Web site, Feedburner. The info link now provides more information about other newsreader programs for Windows and Macintosh users, making it easier for folks interested in this kind of software to try a bunch of different products and decide for themselves which one is best.