Zadar Sea Organ
I was invited to contribute to Paul Ramsay's Consemble sound/mail art project, which, as he points out, is doing its own bit to automate the creative process - leaving composers free to do the sort of things they do best. His site also pointed me towards the amazing Zadar Sea Organ, an installation in Croatia that uses stone stairs on a seaside promenade as the pipes of an organ which is played by the waves. You can hear it in action here.
It seems that San Francisco and Blackpool also have sea organs, although I can't find any recordings online - some comments suggest the San Francisco one may have become clogged up with sand and crabs. Quickly, San Franciscans - buckets and spades to the rescue!