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newsisfree.jpganother interesting news stories treemap data visualization. each rectangle is a single article, of which the size & color indicate the article age & popularity (determined by clicks, subscriptions, or features in weblogs). the map can be filtered or rearrarranged to view articles that meet certain criteria, or that contain specific text. the Hive Group website shows a wide range of similar treemaps that are based on different datasets, such as the iTunes, Wikipedia or Amazon collection. see also newsmap & week in review. []