Very cool hack! From XML.com: An Atom-Powered Wiki:
Using Python and the XPath facilities of libxml2, it was straightforward to build an AtomAPI implementation for a wiki. There isn't even very much code: atom.cgi is just 146 lines of code, while atomfeed.cgi is just 122 lines. This is just a basic client that does the minimum to support the AtomAPI. In a future article the way the server handles HTTP can be enhanced to provide significant performance boosts by using the full capabilities of HTTP. In addition, the SOAP enabling of the server will require some changes. After that we can add the ability to edit the wiki's templates.