For when Tutorials & Snippets just are not enough to learn some aspects of Django in detail, this site now has a recommended reading section.
This has books that I personally have read, or am reading. There are currently two books listed, both really do go hand in hand. Django 1.2 E-commerce & Django 1.1 Testing and Debugging. More details on these is available here as well as reviews to come in the near future.
Details of the 2 books & Sample chapters are also available from the publishers sites;