Django Unleashed is written as a step-by-step guide to building a single Django project. The link below has links to Amazon or to Pearson's own site (DRM-Free!).
If you're looking to go nuts, I recommend reading the first twelve chapters of Django Unleashed, following it up with Harry Percival's Test Driven Development with Python book (also written as a step-by-step guide), and then finishing Unleashed.