Greg Reinacker: I was on a call the other day with some folks in the industry, and someone made a comment to the effect of "we really need to come up with some kind of solution for securing RSS feeds - then we can really do some cool stuff." Before I could get on my soapbox, someone else on the call concurred with the first person. When I mentioned that this stuff has been figured out already, and started describing the existing widely-used mechanisms, they were both a bit surprised, and suggested I write something about it.
http://www.rassoc.com/gregr/weblog/archive.aspx?post=775
Randy: From now on, when somebody asks about RSS security, I'm gonna point them here.