Stephen Burns wrote a book about it: The Art of Poser and Photoshop, based on Poser 7 / PoserPro and Photoshop CS3/4. I've not much experience with it (yet) but to me this resource looks quite recommendable.

Stephen himself has various Photoshop 3D tutorials on his website ( www.chromeallusion.com  )

Just my 2cts

Edit: you need Photoshop CS Extended, of course.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though