Just google The Bernard Herrmann Society and you'll find that site. I don't know if that's the site to which your refer, but the above is still an active site. Or, try www.bernardherrmann.org.
Thank you, John. I can access the site. I simply cannot find someone "active" on the site (i.e. a contact) with whom to discuss the fate of the filmus-l archive. I did note, however, that they are active on Facebook, so I have posted my query about the archive there.
I'm not sure about the admins behind bernardherrmann.org, but I know that the admins at thebernardherrmannestate.com still respond to e-mails. I recently sent an inquiry and got a prompt reply.