Beeminder Goal Tracker and Commitment Device
Beeminder is a goal-tracking tool with teeth. Report your progress every day and make sure to keep all your data points on a Yellow Brick Road to your goal. If you fail to do so your graph will be frozen and you can pledge (by which we mean pledge actual money) to stay on track on your next attempt.
If there's something you know you should do, you really do want to do, you know for certain you *can* do, yet that historically you don't do (and also you're a highly nerdy data freak) then you should try it!