Rich Site Summary (RSS) is a simple XML format designed to let content providers share headlines and content with other websites. RSS defines specific criteria about a story including the headline, the URL, and a brief summary. When a content provider makes that information available in the form of an RSS feed, anyone can access the information and put it on their own website.
Introduction to RSS
RSS 0.91 specification, revision 3
Creating RSS files for your website
http://www.econtentmag.com/Magazine/Features/02/bannan1_02.html
O'Reilly Network RSS DevCenter
Using RSS to Draw New Visitors
A good example of a site offering RSS Channels
Beginer's Guide
News Is Free
The Future of RSS
Asian Business Strategy RSS Channels - good example of a service provider
Google Search for RSS newsfeed
RSS and Knowledge Management
Digital Storytelling
Microcontent News
News Headlines