Comics for Japan is asking cartoonists to create cartoons showing their characters donating to the relief efforts and asking them to publicize ways for their readers to donate. You can check out their site to see who is already involved.
Japan Needs Heroes is looking to create a book showcasing different cartoonists work to help raise funds for relief efforts.
I posted the American Red Cross link the other day. I did hear of someone in the U.S. trying to donate to the Japanese Red Cross, only to get hit with Exchange Rate fees from his credit card company. I don’t know if that is the case everywhere but it might be easiest to donate where they use your own currency. Peter from Wombania, helped get me started on some of them.