Search Engine Watch found a site that lets you compare Google search results from different locations. Google uses geotargeting, so the results from different countries (and even regions from the same country) might be different. For better results, select a data center instead of using google.com. My only complaints are that the site is pretty slow and it doesn't have an extensive list of countries.
This geotargeted search comparison might be useful if you want to have a better look at your rankings, but you should know that there are other factors like personalization that can modify the order of the search results.