It seems that Publish / Subscribe has gone forever.
Pity, it was a good feature, and considering that the
Windows equivalent (OLE) is an integral part of Word
and Windows, it seems a strange decision that Apple
might like to review some day soon.
I'd imagine Apple had a few reasons for not using Publish & Subscribe including that it was little used and was a potential security problem.
OLE on Windows is now known as COM or ActiveX. I work in an office with hundreds of PCs. I've rarely seen a user actually use OLE in day-to-day work.
ActiveX might be integral to Windows, but it's main purpose seems to be letting viruses, trojans, etc use your PC. The OLE/COM/ActiveX functionality is being significantly limited in upcoming versions of Windows and IE 7 because of these security reasons.
Dale