Check out the Windows 7 Silverlight Application on Microsoft Home Page. Is the same application launched on October 22nd, but it is displaying in phase 2 mode. The cool thing is that it is actually the same application, but just configured to display in the "small" mode.
The application has been running smootly without issues and has been seen for millions of people around the world. Is was great to be the Platform Lead of that project and see it live in one of the most visited sites on the Internet.
Love Silverlight, love Blend, love C# !!!