On the IBM developerWorks website, there's a new tutorial looking to help you discover RSS and create your own document for your website, with some help from PHP.
RSS Syndication is virtually ubiquitous these days, so it's imperative that a PHP developer at least understand RSS and how it works. This article explains the basics of RSS, some of its many uses, how to use PHP to create an RSS feed from a database, and how to use the XML_RSS module to read an existing RSS feed and translate it into HTML.
They talk about what RSS is and how you can use it effectively on your site. They give the format of a sample document and show how to pull information out of a database backend to make it fit. They also include a section on pulling in RSS files from external sources and parsing them with the PEAR XML RSS package.