SHELTERBOX: You could donate a box in the name of an organization, individual, etc. Each box includes a tent for a family of 10, cooker, blankets, water purification, tool kit, eating utensils, first aid kit, and other items survivors need following a disaster. Every box bears its own unique number, and is monitored and tracked for which donations are spent on which boxes. Donate here: ShelterBox
AMERICAN RED CROSS: The American Red Cross is currently supporting and advising the Japanese Red Cross, which continues to assist the government in its response. Donate here: American Red Cross
GLOBALGIVING: Established a fund to disburse donations to organizations providing relief and emergency services to victims of the earthquake and tsunami such as International Medical Corps, Save the Children, etc. Donate here: GlobalGiving
