Even tho I'm experienced developer I still had a hard time editing wikipedia articles, because it seems that complexity of markup grows non-linear comparing to growth of article. Good thing they rolling out visual editor.
It's a great article indeed, nice to see a framework built around a fresh concept. My only complain is that people like me, who were disconnected from PHP community for quite awhile, would like to hear more about base principles of Nooku, use-cases where it performs best, and so on without rushing to technical details so early.