"RFID tagging blue mussels to identify oil leaks -- mussels closes, alert sent, line stopped; no mussels harmed"
According to Steve Núñez of Illation, this is done by Norwegian oil company StatOil. See Benefits of Going Green: Who Would Have Thought? I hope the alert is not sent by snailmail.
(Aside: For their role in detecting leaks, blue mussels have been dubbed the canaries of the sea. And don't miss the Statoil recipe for Manhatten Mussel Chowder!)
For a longer description, plus links to Sandy Carter's presentation, see Brenda's post Sandy Carter on Smart SOA in Tough Economic Climate.