Django itself constructs model modules dynamically from your model classes. That's what I used in my first take at the abstract tagging application. Now I found a better way in the current version - I can modify the dynamic module myself quite easily, generate a dynamic model class and push that into the model module. What it actually does is just mimicking what happens when Python defines a class - most stuff is done by the meta.ModelBase metaclass in Django, anyway. I only had to add some module hacking stuff. Python introspection rules!
What this gives you is a much cleaner interface to create the tagrelation class for your model - just a function call, no silly subclassing or superfluous assignment. Everything happens as by magic.
It is magic. 
