Okay I am creating a new CMS system. But I have a general question about Zend - what is the best coding / application design practice using it?

I know views should keep only displaying code (and in fact I integrated smarty so...), controller should be like a bridge between user and the system?

and where and how should core logic be placed? Right now I have simply a folder in the root that contains my classes that interact with database and other such (classes that do actual work)

Sry if I am confusing... I am not asking coding help - rather advise how to structure and lay out the code in Zend - what is best practice todo that.

tnx