Random Pose - Model Poses for Art Students
The "Random Pose" application (search for it in the App Store) is an excellent resource for art students. It contains over 19000 different reference poses for drawing study. Each image is of a male or female subject with the skin removed, showing the underlying musculature.
When you start the application, it shows a random pose. "Next' and "Previous" arrows allow you to move through the images until you find one you like. Use it as a source to draw from, or as a guide to show live models how you want them to pose.
The images come from the Posemaniacs web site. You can see it at http://posemaniacs.com/ along with a description of the iPhone / Touch app.