Ray: Man it's great to see others on board with this and explaining it so well! Thanks to everyone else that is helping this cause.
I will try to explain my reasoning in calling it a Killer App!
MVC is a popular workflow for building web apps. Most template systems (not DW, I mean Zend, CodeIgniter, etc...) work this way. However it requires that you build multiple pages for each page.
1: A page to perform database queries
2: A page to perform functions and such
3: A page to put the output into a design
MX Includes (ADDT Includes) does this all in one page. You simply build the page you want included, with all it's funcitons. The DB Queries, all the logic and the layout. This is exactly the work flow of DW - so it is natural.
On the sites primary page (ie: index.php or other) you would include this page dynamically (or statically depending on your choice). THE MAGIC IS HERE! The "includes functions" know how to separate the three sections of the included file, and place them properly in the primary file.
1: All DB queries are placed at the top of the page, under the primary pages DB info.
2: All "HEAD" info is placed within the HEAD
3: All Body info is placed in the BODY, exactly where the file is included. (side bar, content area, footer, header, etc...)
If you simply do a PHP include - it tosses the new page at that position in the main file. Logic, layout and everything, so that means DB queries are getting done within the body (yikes)! NOT INCLUDES - it separates all the sections and places it all appropriately.
I cannot rave enough about this program other than it needs some updates due to neglect!