zf create project myproject

Adding a new module is easy as pie:

zf create module mymodule

This creates the /application/modules/mymodule folder with complete MVC structure inside (controllers, models and views folders).

My module was not working so after a bit of looking around i've found Akrabat's post that some light on the subject. You have to add to /application/configs.ini the following inside the [production] section:

# enabling modules
resources.frontController.moduleDirectory = APPLICATION_PATH "/modules"
resources.modules[] = ""

Good, now we should have a working module, except we don't have any controllers. Trying to create a controller proved a bit tricky as zf tool would not pleace them in the right place, inside the modules/mymodule/controllers but in the default /application/controllers. The same applies for actions. With a bit of help from TheAshMan on #zftalk i found the right answer:

# create controller Photos_IndexController at /application/modules/controllers/Photos_IndexController.php
zf create controller Photos_Index 1 mymodule
# create the action view inside the Photos_IndexController
zf create action view Photos_Index 1 mymodule

Hope this helps someone as it took me a few hours to figure it out