Interesting article by Mark Pilgrim at XML.com: What is RSS?.
Now that I’m writing a tool that will consume RSS, I welcome this insight on how to deal with the myriad versions of RSS out there. For the moment I’m using XML::RSS, which means I’m restricted to RSS 1.0 feeds (I don’t feel like supporting 2.0 for the moment, and the meat of the tool is displaying the time info on items, so 0.9x is not up to par, for the moment…)
Of interest also the commentary of the author on the process behind his appearance on XML.com