Tesla, Elon Musk's electric car and energy storage company is built using Drupal. The home page features an attractive and engaging, fully responsive HTML5 video, with two simple call to action buttons overlaid on top of the video. On smaller screens the video is replaced by static images of the cars. I also noticed that the site uses panels, and the Shopify platform for it's e-commerce shop.
Who's using Drupal
SpaceX, Elon Musk's space technology company who's ultimate goal is to enable people to live on other planets, is built using Drupal.
Official South Africa 2010 World Cup website, (web development by South African company eConsultant). Includes news, countdown, comments and more Drupal goodness.
Nokia is using Drupal for the "Nokia Research Center" website, which holds research publications, events, news, showcases, job opportunities and more.
The Human Rights Watch website uses Drupal to report on Human Rights, call people to action (support/donate/act), and inform the public. It makes strong use of Drupal's taxonomy system (categories), so you can view content by region and topic. Looks like the image manipulation is done using the Image Cache module.
The site is also available in many languages - just click the language link in the top right of the site to see it in action.