This will come handy if you need to design an app, or just wonder how interfaces are graphically built.
Photoshop Browser Templates
This layered PSD file contains three different browser resolutions; all with easily editable titles, address bars, scroll bars and favicons. Just open the PSD and place the layers on top of the design that you are working on, and voila!
Ultimate iPhone Stencil – Graffletopia
This Omnigraffe iPhone stencil kit contains backgrounds, title bars, buttons, selectors and all other iPhone UI elements. It can be easily resized horizontally by ungrouping, resizing the middle element and then regrouping the elements back into a single button.