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The other implication that most international sites have is the way they handle content and different languages.  You don't want to also create duplicate content issues of your site by increasing your content exponentially using either machine or user generated translations.  We of course, always prefer user generated translations. Another thing to check out is a post on the SEOMoz blog about handling duplicate content.  The area I specifically wanted to point out is the Link rel=alternate section http://www.example.com/path" /> This can be used to tell search engines that those pieces of content are just translated versions of another piece of content so there is no confusion.