Git-backed ORM for Python?
Ignacio Vazquez-Abrams pointed me towards the django-versions package, which while not based on git does offer a good model for storing versioned data. I haven't had the opportunity to work with Django before, but this look as if it may be the best available option right now.
According to the documentation this may not work with the latest version of Django (the documentation says it requires 1.1.x, while Django is up to 1.4 for realz and 1.3 in my distribution's package repository). I guess I'll look at it as a learning experience and see how much work is required to integrate it with more recent Django releases...