The main thing that's worked for me has been a bunch of 5-second level skills generalised over from cognitive behaviour therapy. Oh and making sure I get enough sleep at roughly the same time each night. When that one goes wrong I usually lose most of the next day.

Skill 1: Notice that I am being akrasic. This usually involves noticing that I'm actively looking for distractions, such as trying to remember sites that I haven't visited in a while or thinking about unrelated things such as what I'm going to have for lunch. I can also sometimes catch myself flinching whenever I finish the current thread/site/game that I was using to procrastinate.

Skill 2: Ask myself "why am I not working?". List the answers out, mentally if they're simple and relatively emotion-free, in writing if it's complicated and/or bound up with anxiety, feelings of failure, etc.

Skill 3: Immediately address the reasons why I'm not working. eg. if I'm not working because of trivial inconveniences such as not having a glass of water to hand or not being dressed appropriately then I'll go do those things and return to Skill 2 when I'm sitting in front of my computer again. If it's more complex I'll work out a general plan of attack and the first task I need to do and then start on that. If my reason for being akrasic is mostly emotional such as "I'm afraid to work on this because I think I'll fail" then I'll do things like read the Litany of Gendlin or break it down into sub-tasks that don't cause a flinch and then immediately start working on the first one of those.

I've kept this up with a moderate degree of success for the past 6 months, and have seen a marked improvement in the amount of time I've spent being productive. I've also recently been experimenting with allowing myself timed procrastination breaks, where as soon as the timer goes off I have to stop what I'm doing and get back on task, with initial promising results.

I can also contrast these skills with all the unsuccessful anti-akrasia measures I've tried in the past such as guilting myself into working, installing time-tracking software on my laptop, making to-do lists, meditation, and probably a bunch of others that I don't remember.

Edited for formatting