Here is a list of books that helped open my eyes to the situation:
"Collapse: How Societies Choose to Fail or Succeed" (Jared Diamond) - The rise and fall of civilizations under resource constraints.
"The Long Emergency: Surviving the End of Oil, Climate Change, and Other Converging Catastrophes of the Twenty-First Century" (Grove Press) - Jim Kunstler's scary scenarios for the near future.
"Out of Gas: The End of the Age Of Oil" (David Goodstein) - an early book from a CalTech University professor on the depletion of oil.
"Hubbert's Peak: The Impending World Oil Shortage" (Kenneth S. Deffeyes) - an explanation of Hubbert's peak by a Princeton geology professor, presenting evidence for a worldwide peak forthcoming.
"American Theocracy: The Peril and Politics of Radical Religion, Oil, and Borrowed Money in the 21stCentury" (Kevin Phillips) - covers a variety of topics such as the Bush family and U.S. debt, but also discusses the energy crisis.