so I end up talking to don macaskill last night about an idea that chris and I bounced around a few months ago...
rss ought to include some official tag for related links, both on a global level and a per-item level. the idea stemmed from standard blogs that have "people I'm reading" links in their page that need to be scraped by hand by feed aggregators - everyone would be far better off if those kind of links were official elements in the feed itself... or so our theory goes.
Except RSS 2.0 is in torpor now and will never change.
You could of course specify an extension element in a new namespace. Then you’d have to go through the trouble of convincing a lot of people to support your extension.
Or maybe you just want Atom, where <link rel="related" href="http://example.com/"
is part of the spec out of the box.