Prayers are the best. Cash is a darned close second.
Folks, if you can, send something...even if it's only $5, to the Red Cross and mark it for disaster relief.
There are a lot of poor families that have been hit hard and it may be months before they can assume some sort of normal life. In NO, the 9th Ward is gone and I'm pretty sure these folks don't have two dimes to rub together. They are going to be living hand to mouth for a long time to come. I'm sure the same applies for many families in Mississippi as well.
Every little bit helps.