It needs a bit of 3d know how to import stuff at the moment
but there are ways of getting Sketchup models in, and I think Blander users may be able to magic stuff up if they try hard enough.
( HappyToast B3ta Art Auction http://b3ta.com/links/749374, Sat 18 Oct 2008, 16:52, archived)

ah ok. If you can use blender and sketchup
I don't think it's too far a leap to get things from Poser via Z-brush to work.
( Pasanonic 's been known to cause insanity in laboratory mice, Sat 18 Oct 2008, 17:03, archived)