Brent Franson points to CenSEARCHip, a tool created by the University of Indiana School of Informatics, which compares search results for Google and Yahoo in different countries.
The tool is particularly useful for comparing results between Google’s U.S. results and those shown in China. A search for “Tiananmen square” demonstrates this.
The tool analyzes words and displays results as clusters, with the most commonly occurring words being bolded. More details here.