This is a cool one, at least for iPhone app designers. Prototypes is a Mac app that lets you take those handcrafted mockups of iPhone screens and turn them into a clickable demo you can share with any iPhone or iPod touch user.
Prototypes takes just about any image format, including straight Photoshop PSD files. Once you drag them into your project, adding hotspots is as easy as clicking and dragging. Create a hotspot and then drag the link to whatever page should be loaded when it's tapped. You can assign a "back" action as well. All links can have a transition (in any direction) assigned to them. You can even add notes that display when a page is loaded and then disappear.
Aside from its ease-of-use, the real beauty of Prototypes is the free web service that comes with it. W
