The Chronicle of Higher Education published an article called Divided Attention
a few days ago.
The amount of information in our life has grown so much so quickly that most of us multitask to varying degrees. And there is some satisfaction to that, the feeling that you "get a lot done" at the same time.
The article highlights research that proves that doing more is not at all equal to performing well, or even satisfactory, and that attention and working-memory capacity is still what separates the true achievers from the busy bees.