Blue free PSD ribbon for IOS icons. It has been conceived for fresh installed apps on iso6, useful for mockups, icons etc. By Leonid Jack.
Primera is a GUI kit for creating iOS applications. A free PSD containing a great variety of elements (icons, buttons, sliders, etc.).
Primera free PSD iOS GUI
A complete UI kit containing iOS6 iTunes and App Store. There is the alpha version of the vector & Retina-sized. Free PSD.