Limit viewable CMS pages by group.
To install, add mezzanine_pageview.middleware.PageViewMiddleware to your MIDDLEWARE_CLASSES and mezzanine_pageview to your INSTALLED_APPS somewhere above mezzanine.pages. Finally, ./manage.py syncdb.
I needed the ability to limit the pages that any particular user can see. This application is a middleware to throw a 404 error if the logged user does not have access to a group required to view a particular page, and a templatetag as well as modified navigation templates so the links do not get displayed.
Mezzanine has a concept called page processors that performs something between middelware and context processors for custom Page models. Unfortunately you cannot currently use page processors on the generic Page model.