I tested this highly capable (and free) new sculpting tool called Sculptris (http://www.sculptris.com/download.html) over the week end. I created a few anatomical studies like the one below (from a sphere) and I was really happy with the results. For example I'm really impressed by the dynamic tesselation concept: mesh refines as needed. So smart, it just works great!
Conclusion: I really think it's a great little app. The good thing is that it's free but hurry up this may change in the close future as it's author Tomas Pettersson has just been hired by Pixologics (good for them). The app has also been renamed "Sculptris alpha 5".
I've also done some trials with obj files created with photosculpt I'll try to post this later this week.