I am no expert on these matters, but have watched the tracks of the storms for many years now. In watching the latest track of Ivan it is staying much further south than Francis. This will be unfortunate for Dominican or Cuba and the nearby islands, but should present a break for Florida. These islands have very high mountains that tend to break up the hurricane, thus preventing them from reaching Florida many times. If the storm stays south too long - it could take a similar route to Charley - but unlikely. If it moves to the north before reaching the Dominican - then it will be on the same path as Francis. Neither are in the current prediction.
The unfortunate thing is that these islands are not well suited to facing hurricanes, and every time one hits, we often hear about the catastrophic damages caused by mudslides etc. Lets hope that if this hurricane does hit the islands - much of this damage is prevented.
This is a site that I often follow in the summer months as I watch for danger to my home away from home. It gives great long range predictions - and is usually available even during the busy times.
http://www.solar.ifa.hawaii.edu/Tropical/tropical.html
Also, I travel to Florida almost every year in late August, early September. I have only had one trip interupted by a hurricane - Floyd in 1999. Even then the storm moved up the coast - we moved from Vero Beach to Disney in Orlando - and still enjoyed our vacation. We did not go this year as I am living overseas - but, even after watching what happened - I would still go back in September again. In fact - I cannto wait to get back to spend some of my tourist dollars to help the economy get back on track.
Best of luck to the people who have looked after us so well over the years in Florida - and I hope that everything returns to normal as quickly as possible.