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I actually find it a bit embarrassing to show this site to German students of linguistics or Germanistics due to the English UI and crude design. I'm trying with the German-learners, though.
@thei: The difference is not between German/non-German, but between amateurs/professionals. I have the feeling that professionals want something more well-polished to spend their time on (unless they came from SO and know SE). Of course, that's just my interpretation.