The psychologist Mihaly Csikszentmihalyi called this state flow, and spent years studying the phenomenon. Flow has also been described as ‘a highly productive state of concentration’ in Peopleware : Productive Projects and Teams, and as a ‘Zen-like state of total oneness with the activity and the situation‘ in Wikipedia.This "Flow" doesn't just have to apply to work, or writing code, but can also be applied to other activities in life. At work though, it is a great personal tool to know what triggers you into flow and what triggers you out of it. I have an amazing amount of information at any given time to coordinate and money is always on the line, so I have to know myself and how I go in and out of flow.
Really cool post. Thanks folks over at That Voodoo You Do!