Links:
[1] http://linux.philosweb.com/drupal/category/it/data
[2] http://linux.philosweb.com/drupal/category/it/internet
[3] http://linux.philosweb.com/drupal/category/it/visualization
[4] http://www.gaffta.org/2010/04/09/the-art-of-data-visualization-stamen-design-event-wrapup/