Community
In Navisworks, you can find information in the Help > Help Topics (F1) under Locate and Manage Interferences > Overview of Clash Detective Tool > Get Started.
Here are some tutorial videos avialable on the youtube if you search for Navisworks clash
- http://www.youtube.com/results?search_query=navisworks+clash+tutorial&search_type=&aq=f
There is also a book available through the Autodesk store:
Autodesk NavisWorks 2009: Essentials AOTC
http://store.autodesk.com/DRHM/servlet/ControllerServlet?Action=DisplayProductDetailsPage&SiteID=ads...