sameas.org is quite an implementation of hubjects for the linked data universe. It relies still a bit too much on owl:sameAs, but I begin to believe that owl:sameAs eventual semantics will be the one applications make of it. Only reasoners in closed universes will apply owl:sameAs for what it is in the standard (strict identity). Open Web and linked data cloud will use it as "follow-your-nose" hubs to switch from one representation to another and aggregate information.