[jorhett]

You can just copy Visio stencils into your stencil path now. If you download a Visio stencil you can do two things:

1. Just move it to your stencil directory.

2. File -> Open the stencil in OmniGraffle. When it opens it will prompt you to save it in your stencil directory.

The stencil works very cleanly as-is. It is immediately available, even for open diagrams. The only gotcha is that you'll have to add your own connectors to it.