Robert Barton
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Lifehack favorite, ZenHabits, has put together a Top 50 of productivity-focused sites, like their own. We're priviledged to have made the 'A List' and hold ZH in the same regard.
Check out the list for some Pro-Discovery. Finding 50 resources to help you work better is some good and productive procrastinating of it's own.
The Top 50 Productivity Blogs (most of which you haven't heard about) - [ZenHabits]