So now I have a working OpenID server implementation. Its based on Djangoid project by Nicolas Trangez, but implemented as almost self-contained Django application (it lost some guts during transplantation; lets hope it regrows them later).
It uses python-openid library and currently serves auth requests only for superuser on Byteflow blog.
Its not ready to be included in main Byteflow tree because of syncdb problems when using MySQL, really ugly templates and incorrect python-openid behavior.
To track current state of this application you can use this branch of Byteflow repository.