Over two years ago I wrote "i don't believe there are currently any newsreaders that allow users to subscribe to an OPML file." Over a year ago, I repeated "i believe there are still no newsreaders that allow users to subscribe to an OPML file." I've mentioned this to NetNewsWire author Brent Simmons three times now. Still no subscribe-able OPML.
But now that Dave Winer mentioned the idea, it's being discussed more widely, and I expect it will be implemented by the third anniversary of when I first mentioned it. Sigh. Trickle-down idea economics. Oh well. Better late than never.