I first heard about 'Willpower: Rediscovering our Greatest Strength' during a brief segment on Radio 4 whilst driving into work one morning and thought it sounded worth reading. When the opportunity to read it came up I jumped at the chance.
The basic premise of the book is that we've all got a limited amount of willpower which can be depleted when trying to resist that chocolate bar or dredging up the enthusiasm to go the gym. In the scientific studies the book discusses they found that test subjects willpower is given a quick boost by sugar drinks as the body is craving glucose. This helps to explain the allure of the mid-afternoon chocolate bar!
This is not really a 'self help' kind of book, although there are things you can look out for and suggestions on what you can do in different situations. The sections on dieting (don't!) and raising children are fascinating and well worth reading in their own right.
These sort of books can sometimes be a tough read and tricky to get all the way through I find, but I really enjoyed the readable writing style of 'Willpower' and the mixture of anecdotal stories and scientific studies made it an informative read.