Comscore Press Release states that the Internet is truly becoming global.

More than Half of Top 25 U.S. Web Properties Generate More Traffic from Outside the U.S. than from Within. To read the Comscore Networks press release visit http://www.comscore.com/press/release.asp?press=1057

Note: the data excludes traffic from public computers such as Internet cafes [and libraries] or access from mobile phones or PDAs.