Where are the donation buttons?
At the very least, Amazon and Walmart could set up web-site donation buttons as they did for the tsunami victims.
This has been a serious tragedy. If you want to do something, check this site.
Update: In Canada, you can donate to the Canadian Red Cross and specify "2005 hurricane relief".
Update: The Economist thinks it is serious enough that it might send the U.S. and global economies into recession [thanks to MA for the pointer]:
Update again: The USA Today has lots of photos.
Hurricane Katrina is already known to have killed dozens along the Gulf of Mexico coast, with the death toll expected to rise as rescuers reach more affected areas. Besides its devastating cost in lives, Katrina could push the American economy—maybe even the world economy—into recession