This video helps with the question: 'What is BIM'?
http://www.nationalBIMlibrary.com is the construction industry's free-to-use resource of NBS standard BIM content. Objects are available in IFC, ArchiCAD, Bentley, Revit and Vectoworks format.
NBS National BIM Library content links with manufacturer content such as maintenance literature and CPD. It also links to the UK specification system NBS.
For more information on BIM please see http://www.thenbs.com/BIM
For more information on BIM objects please see http://www.nationalbimlibrary.com