Demonstrates how to use Cocoa Bindings to simplify storing and retrieving user 
preferences. Also demonstrates how to use an ``NSValueTransformer`` to 
archive/unarchive a non-property-list type automatically (``NSColor``, in 
this case).

Originally from `Cocoa Bindings Examples and Hints`__, converted to PyObjC by 
u.fiedler.

.. __: http://homepage.mac.com/mmalc/CocoaExamples/controllers.html