I haven't dared install it just yet, but it might be helpful to those of you who - like me - have most of your really distracting stuff running inside screen.
This can be really useful. I've gotten some good mileage out of Stealth Kiwi [1], a Greasemonkey script with a similar goal. But I find it's even better if I can improve my habits to the point where I don't need such a tool.
I've tried a few such solutions. Worked for some time but there was one problem: too many clicks.
If I want to use it often (and I do) even 1 click too many kills a feature for me.
So if it's going to be easy AND effective - I'll happily use it.
Personally I've learned to focus without aids. Though I do have one aid - the phrase "A hanging concentrates the mind." Comes up whenever there's a deadline.
There's lots to be said for aimless thought. It's where innovation comes from.
If you read the post it mentions that apps like self control are imperfect because you have to keep telling it which sites to block. RescueTime has a huge part of the internet already categorized and scored as distracting or not and lets you tune those settings in broad strokes - so if you go to a site you've never even heard of, if it's a distracting site you'll be blocked without having to have entered it.