Design of CBVs in Django
Form validation, data cleaning, etc goes with the form class in the clean methods
Processing of a valid form should go in an overridden form_valid method

That's it! If your use-case is more complicated you can call out to other methods of your creation from form_valid...
I'm currently trying to get into "Class Based Views" with Django 1.5. 
From the design perspective i wonder where to put the logic to process data comming from a form in a simple FormView.
I know that all form validation code comes into the method form_valid(). But where to put things which processes data of the form. I read that its somehow inappropriate to put too much logic into the form_valid() method.
There are the get(), post(), get_context_data(), head(), etc. methods... which should I use in which case?