I did a Google News search on "Sanibel Captiva", and it appears from the articles it found that damage was relatively light. Charley's worst sector went over the largely uninhabited north end of Captiva, a state park, and there are very few people living on Pine Island. With the main part of Sanibel 15-20 miles away from the eye path, it seems to have avoided major/catastrophic damage. One article indicated that there a few boats lying around the island, though.
As it is, Captiva is still largely inaccessible due to the number of pines that were uprooted.
It is interesting that one of Sanibel/Captiva's long range plans was to rid the islands of Australian Pine, which is not a local tree and is seen as a nuisance tree. This storm took care of that problem.