Project Freewheel lets you view and review DWF files using your browser.
Project Butterfly lets you edit, co-edit, and review DWG files using your
browser. As Freewheel people in this group, if you could try Project
Butterfly and let us know your thoughts, that would be great:
http://labs.blogs.com/its_alive_in_the_lab/2010/01/project-butterfly-now-available.html