I've been using HabitRPG for around a month now to increase the amount of exercise I do and decrease the amount of chocolate I consume. It's caused successful habit formation—I've reduced the motivation needed to do unpleasant strength exercises and 3+ mile runs, even on days where I get no points for completing them. I have little success with decreasing my chocolate consumption, partly because I eat first and pay for it with the game-gold later. I'll keep using this system.
HabitRPG may work for me because I have freakishly great self-motivation and this helps me channel it. It's also my to-do list, though the site crashes with annoying frequency.
I've been using HabitRPG for a couple of months and I don't have freakishly great self-motivation (although I do have a friend who's in my party, so there is some peer pressure/accountability to keep me on track). So far I've found that it's good for habit formation for the kinds of things that are more about remembering to do them than about negative motivation. It's also reasonably good in a GTD sort of way, in the sense that I'll put a big task on my to-do list, and then when it comes time to actually start on the task I break it up into much smaller subtasks to provide myself with incremental rewards towards completion.
This is the public group instrumental rationality diary for June 1-30; it's going up pretty late (sorry!) but entries for earlier in June are welcome.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Next diary -- July 1-15
Immediate past diary -- May 16-31
Rationality Diaries archive