As pretty well everyone probably knows by now, Google has in fact acquired GrandCentral, the mobile-telephony startup, for a rumoured $50-million. Most observers seem to see Google integrating the “one number” approach taken by GrandCentral — which Canadians and other non-Americans can’t make use of, unfortunately — with GMail and GTalk, and possibly with the entire Google Office suite. But others have darker visions: Venture capitalist Josh Kopelman says he is concerned about Google indexing your voice. Some (including those commenting on his post) see Josh’s criticisms as sour grapes from someone who has invested in competitor 1-800-Free411. Maybe Google should buy this thing as well.