Hi again, for my 3rd app it's file hosting. Very simple application to host files. You can download it in here http://code.google.com/p/host2py/
also you can see it live here http://host2py.appspot.com This is mostly for private hosting of small files, but it is designed so that you can add permissions for users who signs up. When you login as the first user, go to /default/setup and click complete, so you can be the administrator.
