Useful intro article: How to Hack RSS and Atom Feeds
"How To: From the ExtremeTech book, Hacking RSS and Atom, we give you the scoop on RSS and Atom Feeds, and explain how to build an aggregator, route feeds to your inbox, and subscribe to multimedia content."

Hacking RSS and Atom

While on the subject of RSS, books and how-to's, another good introduction to the wonderful, wonderful world of syndication (less technical that the above) is Syndicating Web Sites with RSS for Dummies by Ellen Finkelstein.

Syndicating Web Sites with RSS Feeds For Dummies 

I wish you all a very syndicated weekend.