CADtools Revit comes with a utility that can do a batch export of Revit files to NavisWorks.
NOTE:
These instructions are correct for Revit 2010 and NavisWorks 2010 on Windows 32bit. The batch exporter has not been tested under any other conditions, but it might work. For Revit 2009 the syntax for the keyboard shortcut would be different.
Below is a video of the export process.
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