RSS, OPML and the XML platform.
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FilterRSS is a bayesian filter for your RSS. I tried it, rated a couple things, but couldn't quite figure it out. If your interested in playing with it some more, then please blog about it and I'll link it up.
Accredited Degrees out did all comers with their list of 100 Cool Things You Can Do With RSS.
http://www.accrediteddldegrees.com/2008/100-cool-things-you-can-do-with-rss/