I like the way Google handles internationalization, with domains such as google.co.uk, google.nl, google.de etc. I'd like to do this for my own site, but I'm concerned that Google will interpret this as content duplication, particularly across countries that speak the same human language, as there won't be any translation to hint that the content is different. My site is a web application, not a content farm, so is this a legitimate concern? Would I be better off with subdomains of my .com? Directories?