Can Django automatically create a related one-to-one model?

Take a look at the AutoOneToOneField in django-annoying. From the docs:

from annoying.fields import AutoOneToOneField

class MyProfile(models.Model):
    user = AutoOneToOneField(User, primary_key=True)
    home_page = models.URLField(max_length=255)
    icq = models.CharField(max_length=255)

(django-annoying is a great little library that includes gems like the render_to decorator and the get_object_or_None and get_config functions)