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Re:Google's new data center in Finland by Retric on Thursday September 16, 2010 @11:55AM (#1698166)
They probably use a two loop system so most of their pipes are not filled with salt water.
Re:Google's new data center in Finland by j-g-faustus on Friday September 17, 2010 @03:15AM (#1700383)
Yes, that's what they are saying in the linked video, around the 1-minute mark: http://www.hs.fi/talous/artikkeli/Google+raotti+ovea+hakukon...

  [We will be] taking the heat outside of the building and 
  using cold [sea] water to remove it
So it could mean air cooling inside the building, using salt water to cool the air.
Re:Google's new data center in Finland by The_Fox on Thursday September 16, 2010 @03:26PM (#1698837)
Additionally, they can use sacrificial anodes to reduce corrosion and apply an electric current to reduce growth of living things.