Google's results are country-specific: that is, the result set you get is "tuned" to the country from which you're Googling, and that country is based on the IP address of the machine on which you're accessing Google. For instance, I'm based in Canada, and my results, whether I go to google.com or google.ca, are always from google.ca. But what if I wanted to see the results that people in America would see? Or the U.K.? Or anywhere else?
Enter oy-oy.eu's Google World Wide Search, which lets you enter Google search terms and a country, so you can see the Google results that people in other countries see.