I see that Offers of help are coming from all over. For example Castro offers medical aid to U.S. (That's 1100 doctors Castro has said he can send to help - they know about hurricanes in Cuba. They had a bad one last year - Their evacuation procedures were a bit better organised it appears. Death toll was of the order of a dozen people.)
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For individual people I suspect practical aid to the big relief push isn't going to be the thing so much, now that at long last it's getting under way. But in many places in the States I imagine there are likely to be refugees from New Orleans for sometime. I'd think that it would be a good thing to seek out ways to help them as individuals while they are there, and in reestablishing themselves and hopefully being able to go home when that is what they want.

And maybe using the music as a way to build those kinds of connections, and to show that you value what their city and their region has done for you. Here is a link to Cajun.ca, a site dedicated to Cajun and Zydeco, which has given over its homepage to trying to help out. (Lots of good music stuff there too, and links.)