I wrote a step-by-step tutorial on how to convert your sketch to a full vector app icon.

Jérémy Paul posted a animated gif on Dribbble demonstrating a collection of Photoshop Actions to create iOS 7 iPhone mockups. No need to download a PSD and alter.
You can watch and read about the actions here: 

Thirty years ago, the Mac put the power of technology in everyone’s hands, launching a generation of innovators who continue to change the world. This video celebrates some of those pioneers and the incredible impact they’ve made.

Apple - Mac 30 - Thirty years of innovation

In this short tutorial video, the new typography tools in Photoshop CS6 are explained. In case you worked with previous versions of Photoshop - like me - you will notice big improvements on the type features in Photoshop.