A new version of the free Autodesk DWF Viewer is available. The main enhancements in Autodesk DWF Viewer 6.0 are Print Preview, revised Navigator palettes, menus, and tool-bars and an option to hide/show Composer Mark-up status colour coding.
I like the new “always available” layer palette for layer enabled DWF’s (used to be a pop-up dialog) but I’m not a fan of the combined view/shading fly-out with 3d DWF’s. However Print Preview is a great addition and worth the update alone.
If you already have a DWF Viewer installed just open it and use the menu Help>Check for updates feature which will download, un-install the old, and install the new version in one operation (assuming you have install permissions).
You can also download the install file from http://www.autodesk.com/dwfviewer