Are you building an iPhone app? Or have an idea? Do you want to mock it up quickly? The iPhone UI PicKit can help you!
This is a kit of widget images that you can use in your image editing software. This way you can easily create prototypes of different screens and share them with others. There is also a layered PSD available.
iPhone UI PicKit
No need for the iPhone SDK! No need to learn Interface Builder! Just grab the screens and mock your iPhone idea! Thanks Daniel!
(BTW, if you are through with the idea, let us know if you want to develop it. We do iPhone development!)