I don't have time to dive into details but here's a small blur I got from the autodesk press release..
Autodesk Navisworks 2010
Autodesk Navisworks 2010 software -- including Autodesk Navisworks Review 2010 software, Autodesk Navisworks Simulate 2010 software, Autodesk Navisworks Manage 2010 software and Autodesk Navisworks Freedom 2010 software -- enables design and building professionals to unite project contributions into a synchronized model for building information modeling. By enabling team members to more reliably share, combine, review and perfect detailed 3D design models of any size or format, Autodesk Navisworks applications are an important part of the BIM workflow. Updates to the Autodesk Navisworks portfolio include:
-- Improved usability gives customers a more productive working
environment, and new measuring tools and sectioning enhancements help
-- Greater level of interoperability allows for enhanced collaboration.