I have knowledge of and can recommend the following Christian relief agencies that are providing relief to Tsunami-affected people (and other places relief and the Gospel are needed):
 
LCMS World Relief  http://www.lcms.org/pages/default.asp?NavID=891
 
Lutheran World Relief  http://www.lwr.org
 
Salvation Army  http://www.salvationarmyusa.org
 
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Charity watch organizations and some charities
http://www.disastercenter.com/agency.htm
 
Ministry watch
http://www.ministrywatch.com/mw2.1/H_Home.asp
 
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Here are some articles that include links to other Christian agencies providing relief (in general, I don't know about the individual agencies listed in these articles):
 
http://www.elca.org/disaster/sasiatsunami.html
 
http://www.christianexaminer.com/Articles/Articles%20Jan05/Art_Jan05_18.html
 
http://www.interaction.org/sasia (includes non-Christian agencies, as well)
 
 
Pray hard!
Fear not!  Occupy.  Look up!
 
YSIC--
Ghoti
:-)