Check out this book. It's for dieting, but I suspect the ideas can be applied to other things.

http://www.amazon.com/Beck-Diet-Solution-Train-Person/dp/0848731735

So, it's basically Cognitive Behavioral Therapy, chock full of statements like, and I'm paraphrasing, "Just because I've broken down and started eating this cake, doesn't mean I can/should finish it. I can stop immediately and limit the damage."

I'm reasonably sure they even did research on this program and that it works, better than X, Y, and Z.

Also, I don't know whether it's correlation or causation, but I experience very little procrastination or regret and I've been working with David Allen's "Getting Things Done" for years. That is, not masturbating with it or worshiping it, but realistically and critically exploring how to apply it to my life. Other people really like "The Now Habit" for beating procrastination.

Finally, I've found the killer productivity plan to be this:

http://calnewport.com/blog/2008/02/15/fixed-schedule-productivity-how-i-accomplish-a-large-amount-of-work-in-a-small-number-of-work-hours/

http://calnewport.com/blog/2007/07/26/the-straight-a-gospels-pseudo-work-does-not-equal-work/

http://calnewport.com/blog/2008/01/21/monday-master-class-how-to-use-time-arbitrage-to-maximize-your-productivity-profit/