To understand the Project Browser below are some link of video showing the same:
Customize the project browser in Revit 2011
http://www.youtube.com/watch?v=ldJ3p9r-b3U&feature=related
Managing Project Browser View Organization
http://www.youtube.com/watch?v=Vm903HQZ--8
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Shiny Stephen
Support Specialist
Product Support
Autodesk, Inc.