The shaken Martini is mentioned twice in the first Bond film Dr. No (1962): once when Bond has presumably ordered a drink from Room Service to his hotel room, it is mixed by a waiter, who says "one medium dry vodka martini mixed like you said, sir, but not stirred" (a slice of lime was in the bottom of the glass.) Later, Dr. No presents Bond with a drink — "A medium dry martini, lemon peel. Shaken, not stirred."

An interesting fact: James Bond's image is loved throughout the world, women adore him, men want to be like him, but, as researchers say, the famous spy downs too many units of alcohol across the books. Bond drinks about 92 units a week (four times the recommended maximum intake for men!). If James Bond was real, he would probably suffer from impotence, high blood pressure and liver damage. But world's favorite spy is still just a fictional character... so he can afford it.

More Info: en.wikipedia.org