+3  A: 

The autoloader is automatically set up for each module bootstrap. You don't need to configure it manually.

class Admin_Bootstrap extends Zend_Application_Module_Bootstrap {}

is all you need.

Then put your forms in /application/modules/admin/forms/.

Admin_Form_Myform extends Zend_Form {...}

For your custom resources, customize resourceAutoloader:

   class Admin_Bootstrap extends Zend_Application_Module_Bootstrap 
   {
        public function _initAuloload() 
        {
             $resourceLoader = $this->_resourceAuloloader;
             // var_dump($resourceLoader);
        }
   }
   }
takeshin