I've been following this thread closely as I'm dealing with the exact same issue - the need to view pdfs over Macs networked with FM7. For what it's worth, I seem to have hit on a way to accomplish this that doesn't satisfy the FM side of me but gets the job done very nicely.
I've been experimenting with the latest version of Acrobat Professional on the Mac (Version 7) and I've discovered that I can store my pdfs on one computer and open them on at least 2 computers simultaneously using regular Mac system networking.
I'm going to torture test this today on my 5 Mac network. I know it's not what most of us are looking for (prefer to use FM as the front end to access pdf documents), but for me it gets the job done while wiser souls figure out how to accomplish a more elegant solution.
By the way, the Acrobat 7 opens very quickly and sorting/organizing files is a lot more intuitive than it was on Acrobat 6.
Offered in hopes it will be of use. Thanks!