UPDATE: More here: "According to the 8:00 PM EDT intermediate advisory, the aircraft reconaissance flight currently in Hurricane Dean just reported a minimum central pressure of 920 millibars — down 10 mb from the last reading. Dean is strengthening again."
ANOTHER UPDATE: The island of Little Cayman is being evacuated, with inhabitants sheltering on Cayman Brac. Caves in the bluff ("the brac") are the traditional place to ride out a hurricane.