Like Dr. Mohler, I recommend helping through the North American Mission Board Disaster Recovery program. As far as I know, because of the support Southern Baptists give to the board through the Cooperative Program, 100% of what you give will go to disaster relief. I would expect none of your funds to be used for administrative expenses. Here is a NAMB article with more information.
[Update 2012-12-26 09:51:38] The link to Dr. Mohler’s website was redirected. I updated the link to the correct one.