If you are ready to use django as a framework, you can make the django auth system work with it using a django-nerel:
http://www.allbuttonspressed.com/projects/djangoappengine . They are working hard to get support for non-relational databases, such as engine applications in Django. I actually tried this to host my django based site. It really works.
They created support for most django functions, with the exception of some.
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