Venezuela offers foreign aid, US says they haven't: http://www.forbes.com/afxnewslimited/feeds/afx/2005/08/31/afx2199612.html

Canada offers help: http://www.washingtonpost.com/wp-dyn/content/discussion/2005/08/30/DI2005083000573.html

Bemoaning the lack of foreign aid to the US: http://www.usatoday.com/news/opinion/editorials/2005-08-30-letters-hurricane_x.htm

I don't know about the first one, but the second one looks reasonable. I'm reading a lot of heated debates about how no-one has offered us aid, but I see that Canada has. Has anyone heard of other countries offering aid?