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virtualenvwrapper / README

Diff from to
 4.  Tab completion for commands that take a virtual environment as
     argument.
 
+Rich Leland has created a short `screencast
+<http://mathematism.com/2009/jul/30/presentation-pip-and-virtualenv/>`__
+showing off the features of virtualenvwrapper.
+
 ===========
 Quick Setup
 ===========