I'd suggest a cab in from the airport. Are you staying at one of the hotels? If so, transportation once you are in town shouldn't be a problem - hotels are within walking distance, and if it rains, carpooling will certainly be easy to arrange. A good number of particpants will be there with their cars.
Alternatively, someone reading this forum might be coming in at the airport around the same time...and could give you a ride. Any takers?
General information about taxis and shuttles is available on-line at http://www.chs-airport.com/taxi.htm, in case something doesn't work out by Monday.
I plan on flying in that morning and taking the city bus. It's not the fastest means, but it's a good way to get a feel for the city. More info on Charleston public transportation at http://www.ridecarta.com/home/default.aspx
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