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example here is what yahoo does. They send all www.yahoo.co.uk connections to uk.yahoo.com and us users just get www.yahoo.com
So putting one site into a sub-domain would solve part of the issue, you would need to have PHP or a CGI script or similar to do the redirection, you may even get away with using a .htaccess file to do the URL rewrites based on whats in the address bar.