I found some interesting articles at Wired this morning. This one is about the importance of cross-over threats — links between the real world and the cyber world. Here the discussion is on the damage a backhoe can do in the cyber domain.
Wired News: The Backhoe: A Real Cyberthreat
… there were more than 675,000 excavation accidents in 2004 in which underground cables or pipelines were damaged