Fried goes on to suggest that the perceived distractions of Facebook and web surfing at work are false, with "M&Ms" (managers & meetings) making up greater, involuntary, more disruptive and expensive distractions. -- http://gigaom.com/collaboration/jason-fried-why-work-doesnt-happen-at-work/
Disparate non-narrative thoughts:
I've lately been thinking a lot about designers' productivity, and my own now that I'm in a large busy office with both lead (talking to lots of people; making sure communication happens; "managers schedule") and IC (long stretches of uninterrupted time to concentrate) responsibilities.
A month or two ago my manager and I cleared my schedule. I just wasn't getting work done against the big project I've been working on -- I was interrupted and could rarely manage a half- or whole hour to work, unless it was from 4pm until midnight. I have three days a week that are blocked from meetings. I wear huge noise-canceling earmuffs (from Peltor) and will ignore people who try to interrupt me when I'm wearing them. Some people are respectful of this -- if they're interrupting me, it's actually important. Other people prefer to transact minor information exchanges disruptively -- in person.
Best productivity book I've ever read: Never Check Email in the Morning by Julia Morgenstern.
Designers don't have a good way of sharing design work. I suspect an easy-to-use source control system (like one of the biggies, plus a simple front end like TortoiseSVN) would make it easier for designers to work in sync WRT constantly moving targets. I've heard Adobe is working on this, but I've generally been unhappy with their collaboration products so I don't trust that they'll solve the problem.
If you're doing most of your work in Fireworks, you're probably not working fast enough.