From one of the developers of http://www.katrinasafe.com/, which seems to be on its way to being the central repository of survivor data. We will, of course, be providing date to it.
I have to say that I've been really, really blown away by the response and support that Microsoft has given to this project, both the company and the people. Here in Austin, we've not wanted for anything ... food, drinks, everything is brought in and, in some cases, brought to us at our desks. (Eating fajitas while coding can be somewhat challenging.)
Next time I develop a survivors database, I'm gonna do it for Microsoft.