Power From the Restless Sea – NYT 23sep08
http://www.nytimes.com/2008/09/23/business/23tidal.html
Roughly 100 small companies around the world are working on converting the sea’s power to electricity. Many operate in Europe, where governments have pumped money into the industry. Companies and governments alike are betting that over time, costs will come down. Right now, however, little electricity is being generated from the ocean except at scattered test sites around the world.

Scottish companies:
http://www.wavegen.co.uk/
http://www.pelamiswave.com/