GUI Tester makes it possible to visualize ideas to iPhone and iPad devices in a fast and simple way that still can be close to the finished product. The result will be shown in its correct environment, on an actual iOS device, with the accurate look and feel. It's just up to the designer to choose the GUI's complexity from simple sketches to a more advanced GUI with buttons, navigation bars etc.
GUI Tester comes with twelve preloaded examples.
Visit http://www.sk-software.com/guitester for the code to the examples, more information and the complete documentation.