I've found that the response_change method on admin.ModelAdmin to be very useful -- yet I don't believe it is documented in the Django docs at https://docs.djangoproject.com/en/1.4/ref/contrib/admin/#modeladmin-methods. Is the source code the only location for details? If so, where is it? I looked here: https://github.com/django/django/tree/master/django/contrib/admin but did not find anything...
An example of its effective use is here: http://brandonkonkle.com/blog/2010/oct/4/django-admin-customization-examples/.
Thanks!