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Anyone know if RSS <cloud> is used in the real world?

I've been thinking about ways to optimize the delivery of RSS/Atom content, by avoiding polling whenever possible. There's a very obscure bit of the RSS 2.0 spec dealing with a <cloud> element that enables a push-based notification mechanism. There is a brief description here:
http://blogs.law.harvard.edu/tech/soapMeetsRss

and Mark Pilgrim has some commentary on the <cloud> tag itself:
http://feedparser.org/docs/reference-feed-cloud.html

but I was unable to find a full spec, nor any evidence that this element/protocol is being used. (The description says that "UserLand is operating a cloud that conforms to this spec at radio.xmlstoragesystem.com. The workstation side is implemented in Radio UserLand." That server appears to be running, at least it returns a response of sorts to a GET /, but I couldn't find a feed hosted at userland.com containing a <cloud> element.)

Does anyone know of current RSS 2.0 feeds that contain this element? Or of servers or newsreaders that support clouds, other than those mentioned above?

(I do think this is a pretty good idea, although the existing design is both vague and incomplete. I'm brainstorming some ideas for improvements. If anyone else is interested, I'd be glad to have a discussion, either here or in some other forum.)

___________________________________________
Jens Alfke — Social Software Introvert — Apple Computer
Getting bored is not allowed


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