I haven't tried it ... but I believe Cycles was the bridge between Poser and Blender.  There was another one several years ago, but it couldn't keep up with the constant changes that an opensource program goes through.  You might want to check it out quite a few people are using it now.

Cycles is Blender's renderer. Poser Tools was for Blender 2.5 and was by Reddog. Here's the old Rendo thread for it: http://www.renderosity.com/mod/forumpro/?thread_id=2829354

Here's a link to 3dOutlaw's Poser Export to Cycles script. Not sure if it works in recent versions of Blender. It was made during 2.64.
http://3doutlaw.com/home/?page_id=631&did=17

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