Rapt: Attention and the Focused Life, by Winifred Gallagher:

In Rapt, acclaimed behavioral science writer Winifred Gallagher makes the radical argument that the quality of your life largely depends on what you choose to pay attention to and how you choose to do it. …  Gallagher looks beyond sound bites on our proliferating BlackBerries and the increased incidence of ADD in children to the discoveries of neuroscience and psychology and the wisdom of home truths, profoundly altering and expanding the contemporary conversation on attention and its power. Science's major contribution to the study of attention has been the discovery that its basic mechanism is an either/or process of selection. That we focus may be a biological necessity — research now proves we can process only a little information at a time, or about 173 billion bits over an average life — but the good news is that we have much more control over our focus than we think, which gives us a remarkable yet underappreciated capacity to influence our experience. As suggested by the expression "pay attention," this cognitive currency is a finite resource that we must learn to spend wisely. …  No matter what your quotient of wealth, looks, brains, or fame, increasing your satisfaction means focusing more on what really interests you and less on what doesn't.

See New York Times book review.  (Hat Tip:  Legal Writing Prof Blog.)