XML, or RSS, provides a way to subscribe to web content using a feed reader. RSS feeds and XML are powerful tools that allow readers to track blogs easily and in an organized way.

Useful information about XML can be found at these links:

Feedburner

Bloglines

Maximizing Your Effectiveness with XML, Matt Lockshin, k/o, August 2006

Seven Questions for Aldon Hynes, Aldon Hynes + kid oakland, k/o, August 2006