With every great iOS applications comes a great interface that’s been designed well and makes the iPhone or iPad look completely different to the tradition iOS design-scheme – that’s why I have compiled a list of invaluable iOS design resources that’ll help you on your quest of designing a beautiful, unique and functional interface for your iOS application. Good luck and enjoy!
PSD Resources
iPhone 4 GUI PSD (Retina Display)
Smashing Mag iPhone PSD Kit
http://www.smashingmagazine.com/2008/11/26/iphone-psd-vector-kit/
Tutsplus iPhone 4 Vector PSD
http://psd.tutsplus.com/freebies/psd/freebie-vector-iphone-4-psd-file/
Bigkobe iPhone 3G PSD
http://bigkobe.deviantart.com/art/iPhone-3G-PSD-91763608
Designers Toolbox iPhone GUI Elements
http://www.designerstoolbox.com/designresources/iphone/?PHPSESSID=cfe4d92a7c8cf6b6637084e9ccb6bca1
Apple iPad PSD
http://kevinandersson.deviantart.com/art/Apple-iPad-Fully-editable-PSD-152146899
psdGraphics iPhone PSD
http://www.psdgraphics.com/psd/iphone-in-psd-format-photoshop-recreation/
Graffletopia iPad and iPhone PSDs
http://graffletopia.com/stencils/570
MI iPhone Vector Elements
http://www.mercuryintermedia.com/blog/index.php/2009/03/iphone-ui-vector-elements
MobileMe Full iPhone GUI
http://bg2009.deviantart.com/art/MobileMe-Full-GUI-Beta10-124389884
Zandog iPhone 4 PSD
http://zandog.deviantart.com/art/Apple-iPhone-4G-PSD-161681253
Icon Templates
iOS App Icon Template
http://appicontemplate.com/
Cocoia iPhone/iPad PSD Template
http://blog.cocoia.com/2010/iphone-ipad-icon-psd-template/
Design Tools
UI Stencils
http://www.uistencils.com/
Moleskine Squared Notebooks
http://www.moleskine.co.uk/products/notebooks/black/squared/
UniPin Technical Fineline Pens
http://www.amazon.co.uk/UniPin-Technical-Drawing-Fine-Line/dp/B0019M8UQY/ref=sr_1_1?s=kids&ie=UTF8&qid=1332593718&sr=1-1
Design Tutorial and Resource Websites
Design Then Code
http://designthencode.com/
Psdtuts+
http://psd.tutsplus.com/
Icon Resource
http://www.iconresource.net/
Subtle Patterns
http://subtlepatterns.com/
Glyphish Icons
http://glyphish.com/
Interface Inspiration
Mobile Patterns
http://www.mobilepatterns.com/
Dribbble Popular
http://dribbble.com/shots/popular/
Dribbble iOS Tag
http://dribbble.com/tags/ios
Beautiful Pixels
http://beautifulpixels.com/
iOS Inspires Me
http://www.iosinspires.me/
iOS Icon Gallery
http://iosicongallery.com/
Add http://www.iconbeast.com into the list as well. They provide some unique icons for ios app developer.
Checkout my Mac app: Mocks.
http://celestialteapot.com/mocks/
With Mocks, you can rapidly create beautiful, high-fidelity mockups of iOS, iPad and iPhone applications. Mocks is an modern, native app for Mac OS X that gives you special tools to design mockups of iOS applications and screens.