News.com has a good article on the interruption environment technology helps us create:

The typical office worker is interrupted every three minutes by a phone call, e-mail, instant message or other distraction. The problem is that it takes about eight uninterrupted minutes for our brains to get into a really creative state.

The result, says Carl Honore, journalist and author of "In Praise of Slowness," is a situation where the digital communications that were supposed to make working lives run more smoothly are actually preventing people from getting critical tasks accomplished.

Also:

The problem appears to be getting worse. A study by Hewlett-Packard earlier this year found that 62 percent of British adults are addicted to their e-mail--checking messages during meetings, after working hours and on vacation. Half of workers felt a need to respond to e-mails immediately or within an hour, and one in five people reported being "happy" to interrupt a business or social gathering to respond to an e-mail or phone message.

...via Smart Mobs