Peak oil
Well, conversations about peak oil are back in currency.
The Oil Drum is a new weblog anchored around the idea that an energy crisis is inevitable - wheather it happens now or 5 years later is beside the point. It is run by two pseudonymous academics who see "Petroleum economy as the fundamental lynchpin of our present democratic society." (via Kevin Drum via Majikthise).
They linked to this very good primer on peak oil.