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Apple Elements
Stencil of additional Apple hardware and misc. networking components. Excellent for creating physical diagrams.
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.
Network 3D
The following picture shows an OmniGraffle palette I put together for doing network diagrams. It may be useful for others.
OS logos
A collection of OS/hardware logos, including Sun, HP, Linux, Red Hat, FreeBSD, Windows, Debian, Darwin, IBM, and VMware.
Mac OS X Interface
Much interface design at Omni has started with a quick mockup in OmniGraffle. Here's the stencil I've been building, adding elements as I need them. Most designs start with an existing screenshot, with swatches of con...