WebUrbanist has a gallery of early office computing scenes, complete with lots of punched cards, reel-to-reel tape, dumb terminals (with awesome Star Trek designs), and hot hot fashion. (Literally, the clothes look uncomfortably hot. And itchy.) Here are a few favorites:

Office scene 2

Office scene 3

Check out a bunch more, including some awesome Desk Set scenes.

See also: Old Computer Ads, 13 Nostalgia-Heavy Commercials To Make You Pine For 1987, and On the Typography of "Mad Men."