This news is a bit old (9-2008) but I just saw that Vista View has released both a driver and a patch for the Saber DA-1N1 cards that will support QAM tuning under Windows Media Center with the MS TV Pack 2008 installed.
[url=http://www.vistaview.tv/index.php?option=com_docman&task=cat_view&gid=32&Itemid=46]http://www.vistaview.tv/index.php?option=com_docman&task=cat_view&gid=32&Itemid=46[/url]
I don’t use MS Media Center but for anyone who does and has (or is thinking of using) A Vista View Saber DA-1N1-I/E card it could be worth checking into.