Great story from mothernaturenetwork:

U.S. pipelines at a crossroads
As the Yellowstone oil spill and other recent disasters reveal the risks of aging pipelines, MNN takes a closer look at the 2.5 million miles of oil and gas lines zigzagging across the U.S.

Even more alarming in my mind: So many of the pipelines and gas lines traveling the underground of the United States are made of wood. Really.. they do. More here