In the vein of the current popular books that mix psychology and economics, Nudge discusses several examples of how people can be encouraged to make better choices for food, savings, the environment, etc. by orchestrating the way choices are presented. For instance, many, many more people contribute to a retirement plan if the default option is to contribute (even if they can easily opt out.) Children select healthier foods in school cafeterias if the healthy choices are at eye level. And when faced with a complicated choice like that of a health plan people do a lot better if presented with a handful of plans that fit their historical consumption pattern.
The examples are fun and satisfyingly diverse and I hope we can look forward to the application of many of these ideas, especially in the confusing and often scary world of consumer finances.