Coral bleaching has been increasing in the Caribbean as well as elsewhere. 2005 was a bad year and they're talking up 2010, too. I flip-flop on whether this talk is alarmist or realistic but I'm glad I'm gonna get to visit there this June.
In the study, experts from 22 countries reported that more than 80 percent of surveyed corals bleached in 2005, and more than 40 percent of the total surveyed died.
The researchers noted that other testing had found that the Caribbean's reefs had been stable for at least 200,000 years — until the 1980s when bleaching started to happen more often.
More info here and here.