I love communicating too much to be interrupted. Whether I'm writing an essay or a novel, composing an email, or chattering with someone by voice, the last thing I want is to be given a jolt of useless adrenaline every time something new lands in my queue... The mature information worker is someone who can manage his queues effectively.Would that I were so disciplined. But he's right. Effective information work does take some personal habits and intervention in default settings. In addition to shutting down auto-alerts, I like non-distracting streaming audio that helps the time pass as I write -- mostly innocuous techno.
Here's a link to Clay Spinuzzi's nice summary of work on fragmentation.