[pjp]

If you have an AFP Share, files in /Network/Library/Application Support/OmniGraffle/ can be seen by any copy of OmniGraffle being used by anyone on your entire network. You do need administrative privileges on the network to add or remove files there, though.

Unfortunately, symlinking the Application Support folder doesn't currently work. We do have an open feature request for this, though. While I’ve made a note of this thread in our tracker, it's best for folks to drop us a line to be sure we record your requests.