[ Update ] ...did you? :-) The trick is simple: the images below are generated via Microsoft Tag technology. For a lenghtier explanation, see http://blogs.msdn.com/vbertocci/archive/2009/01/09/microsoft-tags.aspx
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Read the complete post at http://blogs.msdn.com/vbertocci/archive/2009/01/08/let-s-see-if-you-figure-this-out.aspx