If you have an account at http://www.amazon.com giving a donation to the American Red Cross (earmarked for tsunami relief) is a click away. As easy as buying a book.
They did a great job in Florida.
But here is a list of all the charities that are listed by USAID in the area. Pick one you are commmfortable with.
http://www.usaid.gov/locations/asia_near_east/tsunami/ngolist.html
Use Barnes and Noble.