And just like that, my dreams have been crushed.  Spiffy video card doesn't look like he wants to capture video.  The short story:
Apparently nVidia doesn't include the video input part of the driver in the default driver package, it's a seperate download and install.  A few vocabs:  VIVO (Video in / Video out), WDM (Windows driver model?).  nVidia offers seperate WDM drivers for video capture.  Unfortunately I suffer from an error that a large part of the community shares, error: "This device cannot start. (Code 10)"  After installing the drivers, this appears on one of the capture devices.  Sure enough, when I start windows movie maker or, more importantly, my testbed c# program... I get a nasty error.
It's much past my bedtime at this point, so I'll take this up another time.
 
