About half way down I came across this:
1:02pm—Question about Another live download video. Whitten: Silverlight being used as "presentation layer."
Why is this news? Well there had been rumors that Silverlight would eventually make its way to the XBox, but this is the first time I’ve actually seen hard evidence.
Seems like it’s only for video now, but hopefully in some future release it’ll be opened up to other uses. (crosses fingers…)