Global Google Results Firefox Plugin --->

Seems to be only for Firefox 3 which some may not like but there you go:

Google Global Firefox Extension V2

Google Global Firefox ExtensionGoogle Global version 2 has been tested and is now ready for general release. V2 is a complete rewrite of version 1 as a result of all the wonderful feedback and feature requests. V2 is a lot more robust, works with more versions of Firefox and has over 20 new features! This version has some pretty advanced configuration options and is compatible with Firefox V3.

Google Global now allows you to view organic and paid Google search results as they appear in almost any location on Earth.
Whats New?

* View paid and organic search results as they appear in different cities.
* View paid and organic search results as they appear in different regions.
* Open all results from countries, cities and regions in multiple tabs for easy comparison.
* View paid and organic search results from a specific IP address.
* View paid and organic search results from any US ZIP code.
* View paid and organic search results from different language results pages.
* Custom advanced saved searches.
* Firefox V3 compatible
* Many more...