SamsungMusic.com (formerly Samsung Music Hub) launched earlier this year pushing the boundaries of HTML5 and responsive web design. It was designed to work (obviously) across a large number of Android devices, with the animations taking full advantage of the built in GPU acceleration available on many mobile devices. The design was done by our awesome partners at Oakland-based Emotive Brand.
With its single page layout, the site is modern and hip - and also happens to sit on top of Drupal. Another large brand name for Drupal, and another demonstration of Drupal's complete compatibility with mobile devices.
Full casestudy: http://www.metaltoad.com/casestudy/samsung-music