TiVo "moment" would refer to a tv show scene, or even a microsecond burst of something so compelling, that the frame(s) are worth playing over and over again over your TiVo PVR.
Janet Jackson's wardrobe malfunction comes to mind.
But now, with CBS and other providers licensing content to the to-be-acquired-by-Google YouTube, those freeze-frame moments are easy to seize on your PC.
You simply pause your YouTube, and look.
And then, you can use any half decent screen capture utility to take a JPEG and forward it to your friends.
Or maybe even put it on your blog as I do here with a "catfight" scene from a recent episode of CBS' NCIS (Naval Criminal Investigative Service) series. Heh, heh.
Two murder suspectresses duke it out.
Hey it's the weekend. Let's have some fun.
Wanna see how the catfight turned out?
Of course you do!
She's hurt, pissed, or both.
But hey, ready for what happens after the knockout?
Darn, I love YouTube.
As do Google's Sergey, Larry and Eric.