This C10 video of the Silverlight card isn't from the Silverlight team (AFAIK).
The video is surrounded by a frame and on a website which accredits the content to
Mason Zimbler - a marketing firm based in the UK.
I'm sure they don't mind using their video (and I know it's been hitting the rounds in the Microsoft internal mail) but it's worth giving them the kudos for it.
Good stuff, and Happy New Year!