include main app controller only once

[eluser]coolfactor[/eluser]
The Controller is a library, so it can be extended by creating a MY_Controller class in your application/libraries folder. It will be autoloaded for you, and you just need to extend your page controller from it. Put all your site-wide functionality into MY_Controller. Also, if a particular page controller does _not_ need any of the site-wide functionality, you can extend it from the Controller class in the usual way.