No, Gustav hasn't disappeared or anything like that. (Darn it.)
Instead, the storm took a turn to the southwest overnight and popped up in an unexpected position that's going to be bad news for Jamaica. Rob Lightbown at Crown Weather Services points out that the computer models are now tracking further to the west, meaning a possible strike in central or western Louisiana or into Texas. Again, these models and predictions are way out there and the cone of uncertainty will certainly include us for a long time, so be prepared.