AmeriCares.org they're a smaller version of the Red Cross. They are one of our charities and they are down there now. We have cards that are designated specifically for Katrina relief efforts. If you are interested in seeing and or purchasing the cards, PM me and I'll give you the info. Sorry but I'd rather not give the info to everyone for security reasons.
Convoyofhope.org I helped a woman on a local freecycle group by donating some pots and pans. Her husband drove their RV down to MS and it's been a comand center of sorts.