Shade, Cararra, Vue and C4D (I think) will directly import and work with Poser scenes. There are plugins for Lightwave (by Greenbriar Studios) that allow you to import Poser figures but you have to rig them yourself. I don't know if Maya or 3D Studio Max have anyway to import Poser content.

Before they made me they broke the mold!
http://home.roadrunner.com/~kflach/