Popular stencils
Juniper QFX10000 Switch
The QFX10000 line of industry-leading switches offers a highly scalable, high-density network foundation for supporting today’s most demanding data center and cloud environments, including midsize to large data centers, private clouds, and public clouds.
TV
Black widescreen (19:6) TV
Dutch TV channel logos
A collection of about twenty Dutch television channel logos.
iOS Gesture Icons
Common touch-screen gesture icons. Pre-scaled to small/medium/large for ease of use.
HTC Sense UI
HTC Sense UI stencil from the Google Android 2.1 / 2.2 Wireframes bundle.
Outfits
Stick-figure Outfits(I guess). This was a bit of a distraction for an hour. Someone could have some fun with it... creating hair-styles, etc.
Extreme Network Switch
Extreme Network Switch: Summit X150-24t Summit X150-24p (PoE) Summit X350-24t Summit X350-48t
Samsung TouchWiz UI
Samsung TouchWiz UI stencil from the Google Android 2.1 / 2.2 Wireframes bundle.
RoboMind graphics
some graphics from robomind (http://www.robomind.net/en/), which is software specifically developed to support technology education. you can now build robomind maps directly in OmniGraffle.