For those of you with flights arriving Saturday through Monday, I suggest visiting the airport's website. MIA had a lot of info on their's from Delta, American, etc., regarding cancellations, waiving fees, etc. Everything in one spot, rather than bouncing around the web. Plus, all the major airports have Twitter accounts, so start following them.
Also, for those of you evacuating, download apps before you leave home. Floridadisaster.org has two really handy apps - one is the public media app which will be handy to get live info from all the public radio stations around the state and the other is the Florida Department of Emergency Management app.