Boarding up your windows with plywood? If possible use screws rather than nails, "drywall screws" are quite good for this.
Have a generator? Run it just for one or two hours out of every ten hours, just enough until the refrigerator and/or deep freezer "charge up" and shut off. Then your limited fuel will last longer. Note: All frost free 'fridges have a defrost cycle. Check the instructions to see if that cycle can be bypassed with a screw adjustment so the 'fridge will come to life as soon as power is restored.
Try to fly out earlier if you think your Disney bound flight will be cancelled. Show up at the airport even if calling ahead doesn't get you anything, then the chances are better of getting on the plane without change fees. I would not plan on flying home early to beat a storm unless something really really urgent was coming up.
If Frances hits WDW chances are things will be done the same way as for Charley. If the parks closed for part or all of a day, folks with Unlimited Magic can get the day dropped, for those folks with hopper passes, the partial day won't be ticked off of the pass.
Attendance is going down as summer ends so ther probably won't be difficulty getting your room because other guests stayed for extra days. The most likely irregularity appears to be the need to put some value resort guests in moderate resorts since the value resorts normally have higher occupancy. First night free or entire stay at the moderate (at the originally booked rate) look like reasonable accommodations.
Guests will have to choose between waiting out the storm in the food court area or in their rooms (or may be directed by CM's without that choice). Nobody will starve when confined to their rooms for 12 hours which is probably the most time guests will not be allowed outdoors or through glass enclosed corridors, but bringing along a few boxes of cereal won't hurt.
Disney hints:
http://members.aol.com/ajaynejr/disney.htm
Last trip, late Aug. 2004, off site. Spent one day sightseeing looking at the aftermath of Charley, which meant one fewer day in the parks.
Next trip (undecided)