I recommend Waka Waka. Its a very well written wiki, that should give you a good idea of how to develop in django. It is an application used by Pinax, which by itself should be huge, to learn.
You can also of course go through some of ubernostrum's code like Registration, profiles and Contact Form, which are a standard in the django world. But as some of them involve dynamic forms, it may be best to get to it, after a little actual coding.
