What a fantastic thread - and an extremely helpful compilation of hotels!

Did I overlook these?

http://www.kempinski.com

http://www.montecarloresort.com aka as SBM

http://www.serenahotels.com

http://www.wilderness-safaris.com

And arguably one could add:

http://www.sofitel.com

http://www.explora.com in Chile

http://www.schlossle-hotels.com in the Baltics

http://www.themarmarahotels.com in Turkey