I was using Leech Block for old fashioned reddit-block for some time, but then I switched to Rescue Time (free version) which tracks time you spend on certain internet sites, and found it much more user friendly. It does not block the sites, but it shows you a percentage estimate of how productive you are today (e.g. Today, 1 hour on internet out of which 30min on Less Wrong—so 50% productive).
I was using Leech Block for old fashioned reddit-block for some time, but then I switched to Rescue Time (free version) which tracks time you spend on certain internet sites, and found it much more user friendly. It does not block the sites, but it shows you a percentage estimate of how productive you are today (e.g. Today, 1 hour on internet out of which 30min on Less Wrong—so 50% productive).