“The idea of flow is identical to the feeling of being in the zone or in the groove. The flow state is an optimal state, where the person is fully immersed in what he or she is doing. This is a feeling everyone has at times, characterized by a feeling of great absorption, engagement, fulfillment, and skill—and during which temporal concerns (time, food, ego-self, etc.) are typically ignored.”
We all have our "things" in life in which we experience that "flow..." and it's different for everyone... but I bet we can all agree that we need more moments in life in which we feel this way!
( for more on Csikzentmihaly & Flow~ check out: http://en.wikipedia.org/wiki/Flow_(psychology)