There is AT the moment a discussion about that at Cornucopia3D.com. You maybe want to go there and read what is written there.
The principle is export as obj from D]S with collecting the materials (textures) into the same folder as where the exported obj is. But i fear this has it's limits. Sometimes transparencies are not coming over correctly. Or bump maps are too strong.

Poser and Vue is the smoother connection i think. And Poser 5 is not really expensive anymore - was even free for a little time.

One day your ship comes in - but you're at the airport.