Networks
Apple Elements
Stencil of additional Apple hardware and misc. networking components. Excellent for creating physical diagrams.
Apple Pro Apps
UPDATED: Now with expanded Motion and Shake icons, + a few others. Most of the major icons for the Apple Pro Apps, including Aperture. Handy for designing workflows.
Basic Cisco Icons
Falk Stern took a set of the basic Cisco router and switch icons for Visio and created a handy OmniGraffle stencil set out of them. Firewalls, routers, switches and even the ubiquitous internet cloud are all available.
