In a nutshell
ao.shorturl is a library for integrating short URLs to a web application.
Its front-end configuration is not specific to any web application framework,
instead it uses various back-ends for different frameworks.
ao.shorturl.appengine implements a Datastore backand for
Google / Typhoon App Engine. If installed as a Django application,
ao.shorturl also provides a template tag for easily displaying short URLs
for any object that supports them.