Popular stencils
OS Elements
OS elements stencil from the Design Stencil kit in the Yahoo! Design Pattern Library.
Mobile & Touchscreen transitions
Graphics showing the flow from one screen to another to indicate to developer how to transition screens after a user takes an action. Can be used for mobile apps or mobile web pages as well.
Windows GUI Design
User interface elements for the Windows operating system, in case you have to design an interface where Aqua widgets are considered a strange and mysterious concept, and licking them is totally out of the question.
Simple Domain Modeling
Simple Domain Modeling for Ruby on Rails application development. No need to UMLize your thinking. Communication not documentation.
Vmware Interface Icons
Icon elements of Vmware Infrastructure interface
xHTML Content-out Approach
A simple set of stencils good for analyze web design layouts according to the Content-Out Approach, as seen on Transcending CSS: the fine art of web design by Andy Clarke (http://www.transcendingcss.com).
Title Blocks
This is a basic set of title blocks I've spent some time cleaning up. They are set up to be solid fill with scaling for stroke and font. Hope they work for you.
Camera Staging
A handy stencil for staging camera movement and more; aspiring directors can set their cameras and actors, pan and dolly movements, show bounce cards and then have someone call lunch.
Sketchkit
The OmniGraffle stencils for the initially Keynote-only Sketchkit, a wireframing toolkit for iOS found here: http://www.sketchkit.com Sketchkit includes pre-drawn iOS interface elements that can be used to create wireframes for iPhone apps. Shared under Creative Commons Attribution ShareAlike 3.0 PDF version can be found...more