So, in case you haven't stumbled upon it yet: there is an auction thing going on at
help_japan, with the obvious purpose. You can bid on (or even offer) all sort of things, from as complex as a custom-made fanvid to as simple as a postcards from all around the globe and everything in between, fanfic, graphics, handmade jewelry etc. Auctions close at the end of March, then the winner is expected to send the price to one of many charities listed on the site, and then get the article when showing proof of donation.
Of course, the noblest thing is just giving money without asking anything in return. But this is also a fun way to help a little.
If interested, my own offering is to make a custom made crocheted doll of any character you want from any fandom. Bid by commenting
HERE