As I've mentioned, I've been playing with Amara/4Suite and CherryPy. Luis Miguel Morillas has been as well. We're both taking things slowly, pursuing it from different angles.
Luis has a "Web-based docbook browser and processor using CherryPy and Amara.". It's a very simple script for rendering as Web content an index and chapters of Mark Pilgrim's Dive into Python book as XML and XML+CSS (which seems to be creeping into the mainstream?).
I also have a demo as part of Amara, cherrypy-xml- inspector.py, which allows you to "inspect" an XML document, through a Web form using CherryPy and Amara. You can load any document off the Web and then enter in an amara expression, such as "doc.html.head.title" and get the result.