Last week I heard an interesting interview [1] of Antony Sammeroff, author of a free e-book titled Procrastination Annihilation. [2]
I hesitate to recommend to you yet another anti-procrastination technique. Most of them are probably gimmicks that wear off quickly, as you have testified. But this book sounds like good stuff to me. I know this guy a little, and I think he's really smart.