django-logging, a python module to help debugging django apps.

From their overview page:

It is really useful to know what your Django project is doing, especially when debugging. [...] Python had a built-in logging system, so django-logging was created to allow it to be easily used within Django projects. [...] When you view a page in your browser, any log messages that were created during the processing of your request will appear at the bottom of the page.

Note: a blog entry about django and logging (with comments from django devs).