Popular stencils
Red Meat
Various cuts of meat for butchery diagrams and other uses. Hamburgers, steak, etc.
iOS Wireframe iPad
iOS Wireframe iPad stencil from the iPad and iPhone Design bundle.
ACCORDS MAJEURS OUVERTS
accords majeurs ouverts pour débutant open chords maj for beginner
BS2 HomeWork Board
A symbol for Parallax's BS2 Homework Board.
Yaesu radios
Various Yaesu radios and a few connectors.
ArchiMate 2.0: Information
Stencil for the ArchiMate modelling language from The Open Group. This is one of the four stencils comprising the core models for ArchiMate 2.0. This stencil specifically contains the information concepts. For more information on ArchiMate, see the website of The Open Group.
Cisco ISE Identity Services Engine Icons PPT
Includes the persona icons for Cisco ISE that you would use in a PPT or logical diagram.
Audio Rack Symbols
Here's a few Rack Symbols that I've created over the last few years. Some are gear-specific. Some are generic. It works if you work in real-size, i.e. the racks are 19" wide in Omnigraffle, and your grid is 1.75" (a rack space).
Social GLYPHICONS
GLYPHICONS Free - Social icon pack. CC-BY license: GLYPHICONS.com