Quite an interesting article on another variant of the MVC design pattern, sounds very similar to Java Struts from the nomenclature however these examples are in PHP. Not sure if it makes sense to have core app services like logging and authentication functioning as filters at the same level as say, the Viewfilter, but worth a read all the same.
While on the subject of interesting web architectures, Redhat have something called Content & Collaboration Management Solutions (CCM) which is an Open Source CMS solution. The Developer’s Guide has some interesting examples of site archictectures, guaranteed to captivate those working in this area.
CCM Software Architecture