Posemaniacs Anatomy
While browsing Think Anatomy I came across an entry that showcased a reference tool for artists.
The website is Posemaniacs where you can choose from many different human figures in various poses. Each stance provides the ability to rotate it, on a y axis, a full 360 degrees. One plus is that the figures lack skin so you can view all the muscles and how they weave into each other.
The rendering is a bit pixelated, specially in full screen mode but that dwarfs in comparison of what you are actually getting, FOR FREE!
Needless to say this is a huge resource waiting to be tapped and I eagerly await future updates to the application and website.