I'm a bit puzzled about Zend Framework modules. I mean - I understand that you would usually want to have frontend and backend module... right?
But - What else would you separate out into modules?
can someone who uses Zend Framework professionally give an example of what modules they have in their application?
In the Zend MVC lingo a module is an independent part of your application. For example if you want to write a Content Management System you will probably have different modules like
Basically each of these modules could act as a separate application (although they will eventually be interconnected). The module approach also gives you an easy way for permission management (e.g. users can only pay for using certain modules).