MongoDB backend for Django-nonrel released

Update: It's possible to use simple JOINs via the django-dbindexer now. Finally, Django-nonrel has a MongoDB backend, which was originally started by George Karpenkov and then finished by Alberto Paro, Flavio Percoco, and I adapted the code to the nonrel backend API. This means you can use the Django ORM (from django.db import models) directly with MongoDB. Even better, you can write code that can