Stephen Downes outlines How to Create an RSS Feed With Notepad, a Web Server, and a Beer, essentially a 9 step process for (ugh) writing RSS Feeds by hand.
An RSS (Rich Site Summary) feed is an XML file used to describe the contents of your website. As your website content changes, your RSS feed changes. Other computer systems, known as ‘aggregators’ or ‘harvesters’, read your RSS feed every once in a while. If you have provided new information, the aggregator takes that information and sends it to readers around the world. Thus information about your site’s contents is ‘syndicated’, that is, rebroadcast to a much larger audience.
An excellent one paragraph summary of what RSS is, indeed, but I would hardly recommend wiriting XML in a text editor unless it is for the command line groupie club. XML code is really best for machines to digest, not humans (or canines).
Stephen’s point might be that RSS is simple enough, and maybe one beer’s worth of effort is not much to ask for.