According to the Posemaniacs's site: "Pose Maniacs supports all artists, including art students and people who study illustrations and mangas on your own. This blog is for uploading variety of poses for nude sketching, and introduces other FLASH training tools for drawing."
Someone on one of the groups I belong to posted this some time back. I really got a kick out of it. It is an excellent site for reference. I love the fact that you can see all the muscles. It is somewhere between an artist's dummy and a live model.
This can be used for gesture drawings (30 second drawings), for practice drawings, and for reference for art pieces. There are so many possibilities!