Randi Rhodes/Habitat for Humanity Change for Change programEric Rice (Eric is still doing animal rescue in the Katrina-affected area as well as working to help rebuild homes. You may also contact him at ericrice3-at-comcast-dot-net to see how you can help.
Katrina Help Portal - lots of listings of help needed and organizations doing relief work
Noah's Wish - following their amazing pet rescue efforts in the aftermath of Katrina, Noah's Wish is now involved in mobilizing for natural disasters.
Network for Good - another portal to relief organizations earmarking donations so designated to Katrina survivors.