x-posted many times, but this site has a listing of many local NO organizations who are:
Organizing at the grassroots level in New Orleans, Biloxi, Houston and other affected areas
Providing immediate disaster relief to poor people and people of color
Directed by, or accountable to, poor people and people of color
Fostering the democratic inclusion of poor people and people of color in the rebuilding process.
http://katrina.mayfirst.org/