The Zeit does not online rely on XML and Weblogs, they also have an open source content management system that looks quite reasonable. It's based on Webdav/Zope/Quark and, of course, XML/XSL.
You can check out the code from their CVS repository.
I keep liking what they do. Ah, by the way, they're looking for XML/XSL/Python/Perl/PHP folks..