The Zune and Windows Phone brought a new User Interface (UI) design to the mobile world called Metro UI.
Not only in Windows Phone or Windows applications we see the rise of this new Metro UI style, even websites are adopting them.
Today even Microsoft launched the redesigned microsoft.com website.
(The application itself is also a great example of a Windows application with a Metro UI)
(if you sign in/up, on the website)
I hope this gives you some design inspiration😉
Update 2012-06-13: added some other sites
Update 2010-08-02: added some other sites