I would like my iPhone app to get dynamic content off the net. This content should be managed using a CMS. I would like to know in particular if I can setup Drupal or Joomla or
Also worth taking a look at Cloud CMS: http://www.cloudcms.com
It's a cloud content management system for mobile and web applications, entirely oriented around JSON and having a fast, fully featured API. Your iOS application could easily grab things, render them, capture data, store it back into the CMS and more. Plus, it gives you a user interface you can drop in front of your business users so that they can create, edit and review things.
Note: I'm one of the developers. That said, worth checking out if for no other reason than for inspiration.