This one from Slashdot:
It’s not news at all that scientists predict an eventual “mega-tsunami” that will sweep across the Atlantic that will still be anything from 60 to 150 ft high when it hits the U.S. Eastern seaboard. This Old News, however, suddenly seems fresh. Like an asteroid hit, it could be millenia away, or tomorrow, that a volcano in the Canary Islands just off Africa drops half a trillion tons of rock into the Atlantic. A short description of the problem from BBC News and some more graphic descriptions (of up to 100 million dead) and shrewd commentary on the politics of warning from journalist Gwynne Dyer.