I strongly believe that anybody can be convinced to conserve if they saw the real numbers of their energy consumption. I also think that it is crucial to be able to visualize impact when making upgrades to a home or business, or when buying a new car. The Department of Energy offers calculators for all these applications. Here are a few direct links to different categories:
Along those lines I want to mention the Energy Star website as well. It offers similar tools and general information on energy conscious decision making.