Many asked me about Google Analytics Api and the possibility to use analytics data on their own application and there are many solutions already implemented even that no Api was provided by Google until today ! The first one written by Felix, a CakePHP model to access Google Analytics from PHP5 and PHP4. And the second one for PHP4 and wordpress users, a wordpress reports plugin using curl to access Google Analytics data, the plugin include a simple implementation that you might check if you are interested, or just write your own as Felix did.
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Update : Felix’s implementation work with both PHP4 and PHP5 as mentioned in comments.