Which state leads the nation in coal production? Which has the lowest total energy consumption? The State Energy Profiles page on the U.S. Energy Information Administration Web site has all that data and much more. We're not suggesting that these energy-use profiles are must-reads, but the site's a worthwhile visit, and at the very least, you'll be prepared for an appearance on Jeopardy—"I'll take U.S. Facts & Figures' for $1,200, Alex"—or have some inane trivia on hand for the next cocktail party you attend.

Using the site's interactive map lets you toggle between energy sources, providing a national perspective on production of oil, coal, and renewables. Or you can click on an individual state to drill down into vast energy data, including ongoing developments. Residents of New Jersey (shown), for example, will learn about the 96 wind turbines that might be erected off the coast of Cape May and Atlantic counties.

—Daniel DiClerico

Essential information: See our Energy Saving & Green Living guide for tips on how to cut your energy use. And read "Uncover the Source of Your Power" to learn what sources are used to produce electricity where you live.