Microsoft has posted the various PowerPoint Presentations from WinHEC 2007.  Tons of stuff including Media Center Extenders, Sideshow, and Windows TV.  I looked through the Extenders presentations and there isn’t too much interesting from an end-user standpoint.  No release dates, strange feature announcements, etc.  Still they are an interesting read if you are interested in the technical side of things.

It was verified that OEMs will be able to support third party codec’s, and as I’ve said in the past the hardware platform already supports them.

Other than that, I remember already seeing most of the information in the WinHEC 2006 slides.