After the French Ministry for Health, Youth and Sport using Drupal started using, the French government switched its official government portal to Drupal! Check it out at http://www.gouvernement.fr. Impressionnant!
The site was built by the French Government Multimedia Team and Adyax Experts (an Acquia partner). About 10 persons worked on it for several months. Most of the work was spent on building custom migration tools to switch from SPIP Agora to Drupal.