icons, templates, and visual languages

Social Icons
http://www.pixeden.com/social-icons/simple-social-icons-vol1
http://glyphicons.com

Visual Language/symbol

http://thenounproject.com

Apple Mock-Up Templates:
http://www.pixeden.com/psd-mock-up-templates

Mobile App icon templates (PSD)
http://www.graphicsfuel.com/2012/07/mobile-app-icon-templates-psd/

Mobile Apps
http://www.mobiletuxedo.com
Collection of iPhone 5 PSD Mockup Templates

http://www.mobiletuxedo.com/collection-of-iphone-5-psd-mockup-templates/

App Icons
http://www.mobiletuxedo.com/category/app-icon-gallery/

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Vector Graphics
http://www.frenchpaper.com/free-images-french-paper.asp#style