here be my 2cents:
1. A back up communications system in place - good old CB radio - car and mobile units are now 5 watts and go for miles, no license required, not monitored and battery powered/low power requirements, with 40 channels to choose from for your 'sowal channel' - ain't nothing else that won't be jammed with idiots talking on and on about the storm. Stay off the bloody ham radio - we (yes, I'm a ARO) do a lot of good but with idiots talking about the storm it gets full too. Licenses have been pulled, recordings are being made, and many, many citations will be handed out for ham radio use for non-emergency communications during Katrina's emergency only traffic.
2. Places for people who live in SoWal to stay if they can't get to their homes or live in their homes - should be a predefined 'rally point', say the big Holiday Inn at Dothan Alabama on 231 (that's ours). 231 through panama city is always connected since it is the railway link and has no long bridges
3. Quick availability of essential supplies (water, food, etc.) - everyone should have an emergency kit always ready for fire, flood (non-hurricane), power outage, etc. It should contain a minimum of bottled water, clean dry clothes and shoes, some non-fridge food and a am radio. Ours is in a sealed waterproof canoe-river-type float bag inside a plastic tub, and also includes a small battery powered tv (priceless), a really big flashlight (priceless), lots and lots and lots of batteries (priceless), a backpacking-type tiny gas stove with little pots and pans (priceless) to make coffee and also to cook and eat as much food from the fridge as possible before it spoils and also to heat with in winter, lots of blankets and a small tent. A snowstorm cut us off last winter and after 4 days of no power or water last winter a man finally came around from the local volunteer fire department to see if those of us who live out here in the sticks were ok. As he hit the door his glasses fogged up, a cup of hot coffee was pushed into his hand and we had to turn down the tv. Nuff said.
4. The support services that would really be provided quickly through local and government agencies, how to get them, and which are most likely to be counted on to respond quickly and effectively in SoWal (again, they may be focused on other areas). Trust no one. Best bet: assume that you are the only one with a still living brain and you will have no problem.
Be self sufficent, think ahead and be sure to test your planning.
Easiest way to set up and test your survival kit is to simply go primitive camping using only your emergency kit. You'll be suprised at what you thought ahead of time was necessary, and what is really necessary (like a razor for shaving, sunburn cream, something really long to read, a freaking chair to sit on, an air mattress, even a small fishing kit)!
Good store for kit supplies:
http://www.dickssportinggoods.com/home/index.jsp