As it now stands, the Australian government has pledged $810 million to the tsunami relief effort.
Germany is next with $674 million.
Japan--$500 million.
U.S. trails in fourth place with $350 million
http://news.yahoo.com/asiadisaster Click on "Leaders Tour Tsunami Areas, Up Donations"
While the U.S. government could do a lot better, the private sector is not doing too badly. See "Profound shift in U.S. culture of giving. Deluge of private donations hits $163 million. Media coverage, Web fueled unprecedented aid." Web fueled except for Jehovah's Witness sites like http://www.watchtower.org and http://www.jw-media.org