A great episode - brought a lump to my throat at the end with Betty going to Reno and Don heading into a soulless appartment building! Great to see Joanie back with a real job to do - will be very exciting to see how next season develops. Also great scene at the end where the staff at Sterling Cooper realise what has happened - Paul's face when he saw they had taken Peggy and not him - pure genius! Sally was brilliant in the scene when Don and Betty were breaking the bad news.
This episode had everything that makes Mad Men so great - brilliant script, multi-layered story telling, great characterisation and superb acting.
Will be counting down to Season 4.