So you want to be a mobile designer? Here’s the tools you’ll need
As I’ve continued along in the mobile design spectrum, I’ve come across a lot of useless design packs for creating mocks for mobile applications include iOS devices, Android, and others. Hopefully, you will find this post useful. I’ve included multiple Photoshop GUI templates, vector packs, icon design, user guideline documents and more. If you have a package you use and don’t see listed here please feel free to comment with the link.
iPad and iPhone
Teehan & Lax iPad GUI
iOS Design Stencils for OmniGraffle

Open Source Vector Icons from GCONS

Android
Android Icon Template Packs and More
Android GUI Widgets and Toolbars

Mac OS X Plug-ins
Speed Limit System Preference

Speed Limit is great for testing your applications natively to get the real Internet feel users will experience on the device. As their Web sites says, “(Speed Limit is a) preference pane for limiting your network bandwidth to one of a couple different speeds—768k DSL, Edge, 3G, and Dialup. This is really handy for testing your iPhone app under normal Edge network conditions in the iPhone Simulator. The new version allows you to restrict the slowdown to only a specific set of hosts.”
Interface Guidelines
UI Guidelines for mobile and tablet web app design
Photoshop Style Plug-ins
220 Amazing Free Photoshop Layer Styles




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Great list. One more for when all the hard work is done:
Photoshop Action for rendering product shots as they would appear on the iPad:
http://www.36pix.com/jesuspad-actions-for-photoshop/