iconography / robert northam
iPad UI - PSD
iTunes Inspired UI Kit (PSD) http://www.premiumpixels.com/freebies/itunes-inspired-ui-kit-psd/
silhouette of the camera vector
iPhone App website template (PSD) http://www.graphicsfuel.com/2012/01/iphone-app-website-template-psd/
Entypo is a set of 100+ carefully crafted pictograms available as an OpenType font, vector EPS and web font. All released for free under the Creative Commons license CC BY-SA.
Mimimalist versions of 315 pop-culture characters. The ninja turtles jumped right out at me...
Clean web GUI kit (PSD)
Illustrative Icon Set - Dev Gupta (dribbble.com) Almost Flat
500+ Web Icons (psd)
Free Simple Custom @font-face Icon Sets by ZURB
Download 20 Flat Icons Vector PSD GraphicsFuel.com | License: Royalty-free, Free for personal and commercial use
Lights and Shadows - I like the depth and sharp edges. Colour is perhaps to subtle.