AtomPub advocates have staged an online interop event. The August2007InteropGrid is posted outlining results of the Atom interoperability test performed earlier this week.
On his blog, Microsoft software developer Joe Cheng describes his experience with the interop event. His objective was to test Windows Live Writer in the context of AtomPub and production-quality blogging services.
Related to the Atom XML Syndication standard, AtomPub is an HTTP-based protocol for creating and updating Web resources.