Here's one that doesn't exactly fit on your scale-- it broke a massive fit of paralysis, but has made only a minor long-term contribution so far--Acedia and Me by Kathleen Norris.
When I heard about the premise, I knew it was something I needed-- the idea was that the collapse of motivation is a current disposition of mind rather than a deep psychological flaw. This was enough to break some of the self-hatred (I'm fucking up, so I'm defective, so it's too much work to bother with anything important) which I think drives akrasia in my case.
The book is a Catholic take on the problem of acedia--what's sometimes called sloth, and reading it has done more to offer me clues than a solution. It's got a historical overview of what people have written on it through the centuries-- it's kind of nice to know that looking for grudges as a distraction from getting work done predates the internet.
I think there's something about time and impatience which leads to paralysis, but I don't quite have it pinned down. It's partly about believing that the work should be done already which makes the process of getting it done seem like an intolerable burden.
I'll add it. How do you rate your experience with it? (Breaking a massive fit of paralysis definitely counts as something people would find useful, so it does count here.)
I recently had occasion to review some of the akrasia tricks I've found on Less Wrong, and it occurred to me that there's probably quite a lot of others who've tried them as well. Perhaps it's a good idea to organize the experiences of a couple dozen procrastinating rationalists?
Therefore, I'll aggregate any such data you provide in the comments, according to the following scheme:
Every so often, I'll combine all the data back into the main post, listing average scores, sample size and common effects for each technique. Ready?
Here's the list of specific akrasia tactics I've found around LW (and also in outside links from here); again, if I'm missing one, let me know and I'll add it. Special thanks to Vladimir Golovin for the Share Your Anti-Akrasia Tricks post.
Without further ado, here are the results so far as I've recorded them, with average score, number of reviews, standard deviation and recurring comments.
3 or More Reviews:
Collaboration with Others: Average +7.7 (3 reviews) (SD 0.6)
No Multitasking: Average +6.0 (3 reviews) (SD 2.0); note variants
P.J. Eby's Motivation Trilogy: Average +5.8 (6 reviews) (SD 3.3)
Monoidealism: Average +8.0 (3 reviews) (SD 2.0)
"Just Do It": Average +4 (2 reviews) (SD 4.2)
Irresistible Instant Motivation: +3 (1 review)
Getting Things Done: Average +4.9 (7 reviews) (SD 2.6)
Regular Exercise: Average +4.4 (5 reviews) (SD 2.3)
Cripple your Internet: Average +4.2 (11 reviews) (SD 3.0)
LeechBlock: Average +5.4 (5 reviews) (SD 2.9); basically everyone who's tried has found it helpful.
PageAddict: +3 (1 review)
Freedom (Mac)
Melatonin: Average +4.0 (5 reviews) (SD 5.4); works well for some, others feel groggy the next day; might help to vary the dosage
Execute by Default: Average +3.7 (7 reviews) (SD 2.4); all sorts of variants; universally helpful, not typically a life-changer.
Pomodoro Technique: Average +3.3 (3 reviews) (SD 4.2); mathemajician suggests a 45-minute variant
Being Watched: Average +3.2 (6 reviews) (SD 4.1); variations like co-working seem more effective; see "collaboration" below
Utility Function Experiment: Average +2.8 (4 reviews) (SD 2.8)
Meditation: Average +2.8 (5 reviews) (SD 2.8)
Modafinil and Equivalents: Average -0.8 (5 reviews) (SD 8.5); fantastic for some, terrible for others. Seriously, look at that standard deviation!
Structured Procrastination: Average -1.0 (3 reviews) (SD 4.4); polarized opinion
Resolutions (Applied Picoeconomics): Average -3.2 (5 reviews) (SD 3.3); easy to fail & get even more demotivated
1 or 2 Reviews:
Dual n-back: Average +6.5 (2 reviews) (SD 2.1)
Think It, Do It: Average +6 (2 reviews) (SD 1.4)
Self-Affirmation: Average +4 (2 reviews) (SD 2.8)
Create Trivial Inconveniences to Procrastination
Close the Dang Browser: Average +3.5 (2 reviews) (SD 3.5)
Get More Sleep: Average +3 (2 reviews) (SD 1.4)
Every Other Day Off: Average +0.5 (2 reviews) (SD 0.7)
Strict Scheduling: Average -9 (2 reviews) (SD 1.4)
Elimination (80/20 Rule): +8 (1 review)
Methylphenidate: +8 (1 review)
Begin Now: +8 (1 review)
Learning to Say No: +8 (1 review)
Caffeine Nap: +8 (1 review)
Write While Doing: +8 (1 review)
Leave Some Tasty Bits: +7 (1 review)
Preserve the Mental State: +6 (1 review)
Acedia and Me: +5 (1 review)
Third Person Perspective: +5 (1 review)
Watching Others: +5 (1 review)
Multiple Selves Theory: +5 (1 review)
Getting Back to the Music: +5 (1 review)
Remove Trivial Inconveniences: +4 (1 review)
Accountability: +2 (1 review)
Scheduling Aggressively...: +2 (1 review)
Autofocus: 0 (1 review)
Take Every Other 20 to 40 Minutes Off: -4 (1 review)
Not Yet Reviewed:
Fire and Motion
Stare at the Wall
Kibotzer
Thanks for your data!
EDIT: People seem to enjoy throwing really low scores out there for things that just didn't work, had some negative side effects and annoyed them. I added "-10 if it nearly killed you" to give a sense of perspective on this bounded scale... although, looking at the comments, it looks like the -10 and -8 were pretty much justified after all. Anyway, here's your anchor for the negative side!