I'm looking at the API for authentication
https://docs.djangoproject.com/en/1.3/topics/auth/
I can't seem to find information on simple user registration form that would send confirmation email as it is the usual way on web sites.
I guess I could do this:
1) Display a form
2) User enters info and submits
3) Save user as inactive, with a confirmation code
4) Send a link with confirmation code
5) User clicks a confirmation link and becomes active
It doesn't seem that difficult but I have a feeling this might be done already, and also there are quite a few edge cases that would need to be considered.
It's not built into Django. There is a reusable app called django-allauth, which will fit your needs.
An app called django-registration used to be recommended, but that is now unmaintained and out of date.
Editor note: django-registration is not unmaintained as of December 2016.
While django-registration used to be the registration system du jour, it has been abandoned by the maintainer and doesn't work on Django 1.6 without patching.
Try maybe django-allauth - I would have used it if I had known about it when I was looking. (As it turned out, I found this question first and used django-registration, wasting a lot of time.)
EDIT 10/2016: Looks like django-registration is maintained again. It's on GitHub now: https://github.com/ubernostrum/django-registration