An iPhone OS OmniGraffle stencil for designing applications for iPhone, iPod touch and iPad devices. The stencil, for now, is targeted at developers familiar with the default characteristics of views and controls provided by UIKit. The stencil shapes are all vector based. The initial focus is on views and controls provided by UIKit and recommended application styles as discussed in the iPhone and iPad Human Interface Guidelines.

http://www.morford.org/iphoneosdesignstencil/