Giant Kites save Cargo Ships 20% on their fuel

"A cargo ship has just completed the first trans-Atlantic trip using kites to help propel it. The giant kite helped save 20% of the ships energy, which will the shipping company up to $2,000 a day in fuel costs once an even bigger kite is hooked up on the next trip."

http://www.gadgettastic.com/2008/03/20/giant-kites-save-cargo-ships-20-on-their-fuel/