List your favorite "metro" implementations!
I am a big fan of the "metro" design/UI principles. Unfortunately a lot of apps and websites do it wrong or half-assedly, even the Windows 8 OS does not fully follow the design principles defined by Microsoft themselves. Link to metro design principles: http://msdn.microsoft.com/en-us/library/windows/apps/Hh781237.aspx
So: What are your favourite metro-style apps, websites et cetera? (please consider apps and websites that are not related to Microsoft or the Windows ecosystem as well!)