OmniGraffle 3.0 Stencils - WAS Visio-equivalent for OS X for network maps

[mac acct]

I went ahead and purchased OmniGraffle Professional 3.0 yesterday based 
on the fact that it has most of the basic network shapes that I need 
and the ability to open and export into Visio (XML) format.

In playing around with the product I don't see any major problems or 
anything with the product.  I am a little upset that the manual (PDF) 
is not yet ready.

I do have one questions.  When you visit the OmniGraffle Extra's page 
there are many extra stencils that you can download.  At the bottom of 
that page, there are installation instructions.  I would assume that 
those instructions are for older versions of OmniGraffle as I could not 
use the extra stencils by following the instructions shown on this page.

http://www.omnigroup.com/applications/omnigraffle/extras/


I did send this same general email question to their support email 
address, but have yet to receive any feedback.  Did anyone else 
purchase the 3.0 version?  Can anyone tell me what directory to place 
the extra stencils in for OmniGraffle 3.0 to see them?

Thanks,

Jerry K