The Question's mentor, Aristotle "Tot" Rodor, had quite a thing for coffee in the O'Neil/Cowan series.
Iron Man: A surprising amount of Tony Stark Fanon holds that, having put alcoholic addiction behind him, Tony has turned to coffee.
Truth in Television: This is actually very common among recovering alcoholics, exchanging an extremely harmful addiction for a harmless and socially acceptable one.
Given the fact that practically all he drinks in the movie is either alcoholic or coffee (except for that weird green concoction during the painting decision for the armor), this may be veering into canon in at least one medium.
He spends much of the second movie chugging various green concoctions, presumably to alleviate the paladium poisoning.
There's also a scene in a recent comic◊ — Iron Man #1 of the Extremis arc — where Tony is woken by a call from one of his many secretaries, who is entirely unsympathetic to his grogginess. Defeated, he requests that she at least hook him up with "the gallon drum of coffee. And possibly some kind of intraveinous drip."
Practically all of the cast in Gotham Central runs on caffeine, being cops. The coffee machine holds a very important in the MCU's interaction life. Seriously, how hard is it to fill the coffee maker again when you finish the damn coffee?!
In the new (2010-11) The Flash comic book, Iris Allen is seldom seen without a coffee cup in hand. Her IM icon is even a cup of coffee.
Invoked by the villainous Neutron Bum in issue #4 The Awesome Slapstick, who goes on a city-destroying rampage when no one can give him some money to buy a cup of coffee.