The attitude of many countries seem to be that the US has enough resources to take care of itself:
"Germany also said it would offer aid or money if requested by Washington, though officials said the U.S. was well equipped to deal with natural disasters."
"At the United Nations, the official spokesman for Secretary-General Kofi Annan said the U.S. was the country best prepared in the world to deal with such a natural disaster."
Though they are probably right, it does seem a little cold. Anyway looks like people are taking the stance of kind words and if asked for help they'll chip in but that the US should be fine on its own.