Started unplugging my DSL modem for periods of offline work or reading e-books off an internet capable device when I don't want to be distracted by impulsive browsing. If stuff comes up that I want to look up, I write a line on a post-it note. Seems to be just the right level of annoyance to get up and plug the thing back in that I won't do it without thinking.
I use StayFocusd(Chrome plugin) for similar purposes.
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