Heard your talk at SXSW today (the pencils are the wrong color... the blue is fine.) and greatly enjoyed it. Checked out your blog and this post really hit home. There's a great Time Magazine article (time.com/time/magazine/article/0,9171,1147136-2,00.html) about the financial cost of interruption. In it, the University of California at Irvine did a study of technology workers. Here's a quote:

"Once they were interrupted, it took, on average, a stunning 25 minutes to return to the original task—if they managed to do so at all that day. The workers in the study were juggling an average of 12 projects apiece—a situation one subject described as 'constant, multitasking craziness.'"

In a progressively addictive multitasking society, I can only find peace by working super late into the night. No one calls, texts or IMs. It's my cave.