During lunch I took a 3D part (.ipt) from Autodesk Inventor 9 and created a quick 2D drawing (.idw). I then created 2 DWF files, one is a 2D DWF and the other a 3D DWF. Both are viewed in the Autodesk DWF Viewer 5 beta.

This is a screen capture of the 2D .idw drawing in Autodesk Inventor 9 Beta.
Click the image to see a larger view.

This is a screen capture of the 3D .ipt part in Autodesk Inventor 9 Beta.
Click the image to see a larger view.

This is a screen capture of a 2D DWF created from Autodesk Inventor and viewed in the new beta of Autodesk DWF Viewer 5. The DWF file is only 119Kb and fast!
Click the image to see a larger view.

This is a screen capture of a 3D DWF created from Autodesk Inventor and viewed in the new beta of Autodesk DWF Viewer 5. The DWF file is only 49Kb and is fast!
Click the image to see a larger view.

Enroll for the Autodesk Inventor 9 as well as the Autodesk DWF Viewer 5 Beta at:
http://betaprograms.autodesk.com/betaweb.htm

Read more about Autodesk Inventor products from the Autodesk Inventor Team's blog:
http://autodesk.blogs.com/in_the_machine/

Cheers,
-Shaan