I am presently doing Alternate Day Fasting. (There a thread about it on the Nutrition page, that you might like to look at.) It is based on the work of Dr. Johnson, so it is often known as Johnson's Up Day Down Day (JUDDD).
I've had great success with it, but I am looking to lose a big chunk of weight, not the last few pounds. It is also not a quick method. (Average loss is one pound per week.) But it IS very sustainable, and I have found it is very easy to come back from 'slips' using this method. I stick to low-carb primal, but the times I have strayed from it on my Up Days, I am able to get back on track with no difficulty.