I just checked out the Lutheran World Relief . They are preparing to organize their disaster relief efforts in the areas impacted by Hurricane Katrina.
If you can spare some money to help the effort, the website has a secure online giving option. If you're in a place in your life where you can provide some hands-on assistance, they can tell you how to do that too. You can also visit the Red Cross website for more information on how to help. And we can all hold the people in this area -- particularly evacuees, those in harm's way from the expected flooding, and all those involved in rescue, maintaining order and other relief efforts -- in our prayers in the days and weeks to come.