RSS Field Descriptions
http://www.feedforall.com/rss-fields.htm
RSSxl - Convert an HTML Web Page to RSS
http://www.wotzwot.com/rssxl.php
100+ Resources for Web Developers - AJAX CSS PHP MYSQL RSS
http://blog-well.com/2008/03/04/100-resources-for-web-developers/
RSS Feed Validator
http://feedvalidator.org/
FeedBurner - RSS
http://www.feedburner.com
Introduction to RSS/XML feeds
http://www.ibm.com/developerworks/library/w-rss.html?dwzone=web