Having seen the destruction of Katrina first hand, I, too, urge everyone to evacuate. Pack your car with your pets and your most cherished memories, and leave. The rest is replaceable. You are not.
It's never a bad idea no matter where you are to have emergency supplies for 72 hours stashed somewhere in your house. I live in California and we never know when the "big one" is going to hit, so we have an emergency pack in the garage where it can be easily found. I recycle the water and food every year, but between hurricanes, snow storms, tornados, earthquakes, ice storms and whatever else nature can throw at us, it's a good idea to be ready. Just a thought from a member of the Red Cross and a Search and Rescue team.