Your right it is interesting I really do like it. I've implemented postboxes in my plugin since my review but my head went into overload even considering applying the controller class to my CSV 2 POST plugin simply because it's set in its ways. I like the "run()" method approach to loading the plugin and begun adding that but it will need to be phased in slowly as I've relied on globals a lot.
I have a tabbed menu per page. Each view is not registered as a page. So I discovered that each view shares the same user setting for postboxes. Move a box on one view and the others move to the opposite position. Now I seek a solution which is probably to register every view/tab as a page but hide all but the original pages from showing in the plugins WP admin menu.
If I get that done it will lay groundwork for really good interface and get around what I think is a WordPress limitation. That limitation is either an easy way to create views which are well registered but not always treated as pages.
Anyway it is safe to say I coped some code from your plugin and will be making good mention of your plugin in various places online. I have a couple of lines in my plugin that indicates you are the original author of the class also.