3D Systems announced that they have launched a free 3D content tool that will let you view, edit, and share 3D files on your iPhone and iPad. It's called nettfab Mobile and you can check out the videos here: http://www.netfabb.com/mobile.php
Looks pretty cool, although with my poor eyesight I would prefer to use the iPad. It's free and you can download it through iTunes now.
3D Systems is collaborating with netfabb as part of the company's campaign to democratize access to 3D content-to-print. Let me know what you think of its usefulness.