Autodesk has released 123D Catch, Sculpt, and Make for the iPad. These apps allow you to capture, generate, and create 3D objects. Catch allows you to take a series of photographs of an object from a variety of angles, send those photos to Autodesk's cloud server, and generate a 3D object that you can then view and manipulate on your iPad. Depending on your lighting sources and skills as a photographer, you can create some quite realistic images. Catch can be used by itself or it can be used with the other tools to manipulate and build real 3D models. I don't quite understand why these tools are free -- if they're part of an intro by Autodesk, or if they will continue to be that way.