iPad GUI Kit in PSD Format
This version offers a canvas size true to the iPad at 768×1024. In addition to that most of the graphical elements are provided in vector format allowing you lots of room to scale things up for high resolution presentations. This version is also layered in PhotoShop making it easier for you to go nuts with your mockups and client presentations!
http://www.rawapps.com/849/ipad-gui-kit-in-psd-format-is-here/