Fun is the office F word. Ever heard of anybody getting up in the morning and going to fun? We go to WORK. But, with the dot-com boom came ping-pong tables and nerf guns. All those tech geeks in Silicon Valley looked like they were having so much fun. So, in these economic doldrums -- is having fun at work as important as it used to be? Who's having it, who's not? What's the history of business casual? We'll be exploring these questions and more in our "Workplace Culture" series.