For the Mac-owning sound designers out there, I recently created a set of templates/stencils for creating rack drawings in OmniGraffle. There’s a template with a generic plate border and title block, and a stencil set with rack units/blanks and racks of all sorts. If it’s of use, it’s yours for the taking, download the 52k zip file here.
(Click for a bigger/better preview image of the stencil set)
I may eventually expand it with a set of symbols for signal flow diagrams as well, so keep posted for updates.