Visio is my primary diagramming tool. I wanted to point out a couple of recent links I came accross that help in diagramming various things.
The first are stencils that are used on MSDN and TechNet diagrams – these are a set of stencils that can be used in Visio just by adding the stencil to the list for your diagram. Located here:
Visio stencils for IT Pro posters
The other is Visio Toolbox.
This site is a hosted by Microsoft that provides basic background but there is a new add-in along with some others. The new add it just release
There are Add-ins, Templates, and Tools
Some of the Add-ins
There’s also a tool that will build a stencil for you if you just upload some images.. That’s here: