I’ve started writing a tutorial on the topic. It covers pretty much all the steps in the official Django tutorial, and it includes full browser-automation testing with Selenium, so you can test javascript too…
http://tdd-django-tutorial.com/
(sources at https://github.com/hjwp/Test-Driven-Django-Tutorial)
[edit 2013-04-15] I’m now writing a book for O’Reilly on the topic. IMO it presents things in a much better way that my old tutorial. Check it out at
http://www.obeythetestinggoat.com/
(it’s still free if you want it to be!)