In addition to the Autodesk discussion groups, another place to obtain information is from the Autodesk web site:
Autodesk DWF Viewer
This is the starting page for information about the free Autodesk DWF Viewer.
Autodesk Design Review (formerly known as Autodesk DWF Composer)
This is the starting page for information about Autodesk Design Review. A tutorial is available on https://www.autodesk.com/designreview-tutorial.
Autodesk DWF Writer
This is the starting page for information about the free Autodesk DWF Writer.
World of DWF
This is the starting page for information about the Design Web Format itself.
This is a collection of sample DWF files submitted by Autodesk customers.
DWF Customer Showcase
This is a collection of sample DWF files and associated success stories about Autodesk customers.
Autodesk DWF Developer Center
This is the starting page for the DWF Developer Center. It has a variety of information as well as links that eventually lead to the DWF Toolkit.
Autodesk DWF Toolkit
This is a shortcut for navigating to the download page for C++ programmers to obtain one of the freely available DWF Toolkits.