Great news: Windows Media Center 2005 to support high def TV. Seems obvious at this point, but good to hear official word on it.
I'm curious how the HD TiVo vs a new media center box would stack up, as Thomas' review highlighted the lack of high def support for media center. In terms of upgradability, I bet a windows media center box would be much easier to dump an extra 250Gb drive into. We'll have to wait until these are released and in the wild before knowing if Microsoft finally has a hit on their hands.