reposting from: http://groups.drupal.org/node/18203
http://drupalsites.net
http://drupalmuseum.com
http://drupalsn.com/projects
http://cmsdesigns.org
http://drupalwebsites.com
http://drupalbased.com
http://drupaldiy.com/showcase
http://mydrupal.com/drupal_showcase_some_top_drupal_sites
http://devbee.com/drupal_showcase