How can I introspect properties and model fields in Django?

If you strictly want just the model fields and properties (those declared using property) then:

def get_fields_and_properties(model, instance):
    field_names = [f.name for f in model._meta.fields]
    property_names = [name for name in dir(model) if isinstance(getattr(model, name), property)]
    return dict((name, getattr(instance, name)) for name in field_names + property_names)

instance = MyModel()
print get_fields_and_properties(MyModel, instance)

The only bit that's extra here is running through the class to find the fields that correspond to property descriptors. Accessing them via the class gives the descriptor, whereas via the instance it gives you the values.