On the importance of "Flow" in work environments you might ask... WHAT IS FLOW ?

The psychological state of effortlessness, where you become completely absorbs and time seems to FLY BY is flow.

Asking Google for a definition you just get crap... Google Search: define:flow [1]

at this book store [2]

The question he posed himself was simple: What is fun? What makes some experiences enjoyable, and other experiences not?

For a brief overview I also found a very nice essay [3] that copes with the personal experience and influence that the book had on the author.