Add pointers to simple nb manager and bookstore.

docs/source/interactive/public_server.rst

@@ -135,6 +135,18 b' files in the working directory of the notebook server, also known as the'
 use a different notebook manager class, which can 
 store the notebooks in a different format. 
 
+The bookstore_ package currently allows users to store notebooks on Rackspace
+CloudFiles or OpenStack Swift based object stores.
+
+Writing a notebook manager is as simple as extending the base class
+:class:`NotebookManager`. The simple_notebook_manager_ provides a great example
+of an in memory notebook manager, created solely for the purpose of
+illustrating the notebook manager API.
+
+.. _bookstore: https://github.com/rgbkrk/bookstore
+
+.. _simple_notebook_manager: https://github.com/khinsen/simple_notebook_manager
+
 Known issues
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