Circling back around on this now that we're back in the states with internet again - very glad to get extra confirmation that no one was aboard or injured. There was not a lot of reliable information available while the boat was on fire. A number of people immediately jumped in their dinghies and went out to try to help, but the boat was obviously a lost cause and they found no one in distress. For what it's worth, the boat did not seem to drift through the mooring field at all (a major concern for us because we were moored fairly close by) - it just burned in place for hours and then sank. CaveMan, that probably was the same boat anchored next to you - the only thing left standing the day after the fire was the floating ramp (and maybe some impenetrable boxes of mac and cheese, as Sailaway mentioned).

We saw the kiteboarding guys perform some amazing stunts the afternoon before the boat caught fire, and again at Saba a few days after. Really glad they are ok.