When you're designing a new app, you can figure out how the app will look and work by creating mockups of each screen. This can be as simple as drawing sketches on paper, or you can use a number of software tools to create a digital mockup.

Hardcopy

iPhone Stencil Kit - a stainless steel stencil for drawing iPhone interface elements.

iPhone Application Sketch Book

Digital

iPhone GUI Elements for Adobe Photoshop

iPhone Stencils and iPhone Wire Frames for OmniGraffle

iPhone UI Vector Elements for Adobe Illustrator

MockApp offers templates for Keynote or PowerPoint

Apps

AppCooker is an app for designing app mockups.

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