Here is a link to a free program some may already know about, or some may find useful. Called PoseRay, it is a model conversion program which I believe was developed primarily for conversion of models to Moray scenes. However, it will also import several major formats and output obj and mtl files. It will also support Poser and DAZ Studio scenes.
Imports Wavefront obj and mtl, 3DS, LWO, DXF, POV,INC VRML, RAW
Exports POV, Moray, Wavefront obj and MTL
Many other features you may find useful.
http://mysite.verizon.net/sfg0000/