Dougal Campbell: It took me a few minutes to understand what problem this is addressing. Basically, the idea is that we want a more user-friendly experience when people click on RSS feeds in their web browsers. The problem is that if you set up an application to handle certain MIME types under Windows, the application only gets the content, not the URL that the content came from. So, there's not an easy way to add a feed to your RSS aggregator application by simply clicking the feed's link. But by adding a self-link to your feed, as suggested by USM, we get a standard way for a feed to specify a canonical URL for itself, thus allowing applications to handle the URL as needed.