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Best: Joan gets an account
Episode: "A Tale of Two Cities" (610)
Joan's decision to accept last season's indecent proposal from Jaguar executive Herb Rennet and subsequent rise to partnership kept resurfacing this season -- Don ultimately lost the firm Jaguar's business because he couldn't stand Herb, which understandably upset Joan -- but never more powerfully than when Joan decides to go after an Avon executive to woo their business.
Eager to prove she can land a client without using her body, Joan went around Ted and Pete to set up a meeting for herself, Peggy and Avon. That led to an awesome showdown with Peggy -- she felt Joan always belittled her professional ambitions, while Joan felt Peggy never respected her -- and ultimately a standout moment when Peggy helps extract Joan from getting reprimanded by Ted and Pete.