A Cre8asite Forum thread has a discussion on a new tool by oy-oy.eu that allows you to specify the location and data center you want to search in and it will show you a side by side comparison of your Google results between the two locations/data centers you selected.
The tool is located at http://oy-oy.eu/google/world/.
You type in a search query, then specify one set including a location and a data center. The available locations include; (local), Belgium, Canada, China, Denmarkm India, Iran, Italy, Korea, Latvia, Mexico, N/A, Netherlands, Poland, Spain, Switzerland, Thailand, Turkey, United Kingdom, United States, or Uruguay. There are a number of data centers to choose from as well.
Have questions or feature requests? Join the discussion at Cre8asite Forum.