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USA Red Cross: http://american.redcross.org/site/PageServer?pagename=ntld_main&s_src=RSG00100E013&s_subsrc=ONR_MainDonateButton
Canada Red Cross: http://www.redcross.ca/article.asp?id=2372&tid=032
United Kingdom Red Cross: http://www.redcross.org.uk/Donate-Now/Make-a-single-donation/Japan-Tsunami-Appeal
Australia Red Cross: http://www.redcross.org.au/japan2011.htm
New Zealand Red Cross: http://www.redcross.org.nz/donate (Note: due to the recent quake in New Zealand, you will need to choose the Japan earthquake donation in the drop-down box).
German Red Cross: http://www.drk.de/weltweit/asien-nahost/japan-hilfe-nach-erdbeben.html
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