Yes, this is a good idea. From the Consumerist:
According to the Center For Science In The Public Interest, menu labeling legislation is gaining momentum in the California State Assembly. The menu labeling law “would require chain restaurants to list calories on menu boards and calories, saturated and trans fat, sodium, and carbohydrates on printed menus.”
The fact that some of the fast food companies are trying to block it proves that it is a good idea. Obesity has become such a problem in this country that it only makes sense to know exactly what you are eating. It might make someone think twice.