If you really want to help, find a respected, known, and one that isn't totally going to pocket the money organization and slap them with a briefcase full of money.
That'll go to Japan. There's really no need to pump all our money to SE in the name of helping all Japan.
Last time I checked, they weren't Japan's spokesperson.
Honestly, as much as I feel bad for Japan being in the state it's in now and having to go through seventy hells, people are just beating the living crap out of this horse.