Possibly of interest...

Translate Google SketchUp, STEP, IGES, Rhino and Autodesk files
convert SKP, 3DM, STEP, IGES, OBJ, DXF, DWG to 3DS, OBJ, XAML 3D, and 2D PDF file formats

http://www.babel3d.com/

Dev. of 3D Paintbrush :)