There are some actual architectural constraints that help these "Cloud" applications make rain, not just drizzle. One of them, and the one that has been almost entirely missing in so-called "GeoWeb" applications to date, is hypertext.
Speaking of Atom, Joe Gregorio has recently made a neat video introduction to AtomPub.
Update (2008-08-04): "It's almost as if the [Web was] designed for this stuff."
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