Autodesk is now shipping the latest Autodesk Viz 2006.
Some of the new features:
* Tool Palettes
* Improved Interoperability with Autodesk Design Software
* Sweep Modifier
* Content Browser
* Scene State
* Layer Manager
* Schematic View
* Radiosity Adaptive Subdivision
* Rendering Presets
* Autodesk 3D DWF Exporter
* Array Tool Preview
* Quick Align
Get the Autodesk Viz Preview Guide Here