If you can, please donate to the American Red Cross and select that you want to give to Hurricane Rita.
I don't want to sound selfish asking for you to donate to it instead of Katrina, but Rita has not had as many donations as Katrina has simply because it just happened this weekend. Of course, on a personal level, Rita is more important to me because it affected my family.
There are other organizations to give to as well, but I know the money will be put to good use by the Red Cross.
(image from cnn.com of Port Arthur, TX)