Apparently many of those respondents are not familiar with or have not had a chance to use Autodesk's DWF format for sharing CAD data. That is surprising, because free software to read and write DWF ...
A set of standalone file converter tools changes Autocad files to other formats. Supporting all versions of DWG/DXF files, the DWG to Image Converter changes DWG and DXF files to JPG, TIF, BMP, GIF, ...