Not that this really answers the question, but you can choose from the overwhelming number of suggestions and further linked references on this page:
http://tsunamihelp.blogspot.com/

I personally have distrust, without hard evidence to justify it, of the Red Cross administrative fees and the incompetence of the U.S. Federal Disaster Relief agencies. (It's based on purely anecdotal tales involving localized actions in California and Florida. Both criticisms/concerns are based therefore only on guilt by association.) The legitimacy of those concerns are not important given the immediacy of this situation.

I ended up choosing the Salvation Army, whom I trust, again with no hard evidence to justify it, and Doctors Without Borders. But you can readily find very localized entities in this internet age, that will hopefully receive cash exactly where it is needed. (But if you go too local, then maybe the cash won't be very useful if what is needed can't be bought.) No easy choices but I think you have to take a quick stab and hope for the best.