Not sure where to put this, but I found it so interesting.
Hungry Planet (ABCNews.com)
They've assembled a weeks' worth of groceries for "typical" families in many different countries. The visual gives additional impact to the differences. And if you mouseover the bottom of the pictures, you'll get text that explains the family, plus the monetary value of the groceries they live on.
I'm still rather blown away that the family of four in the US spends $350 a week on food. Good grief. We have five and spent only $125 a month or so, including all the cleaning supplies and plasticwrap/foil and things.