Japanese scientists have deployed two prototype solar sails in space.
http://news.bbc.co.uk/1/hi/sci/tech/3555048.stm
Meanwhile back on Earth maybe we should be concentrating on utilising solar power on ships which can convert the readily available source of hydrogen (i.e. the sea) into fuel. We've had the first hybrid cars, now how about the first hybrid boat?
see:
http://www.wired.com/news/technology/0,1282,63163,00.html
http://www.wired.com/news/technology/0,1282,37333,00.html
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