Sounds too possible for me to want to play with. It's like a federal offense. I'm sure Tivo doesn't do anything with the logged information except sell it to advertisers and networks. Just think, once widespread adoption occurs, this is far better than any current rating system. You can know exactly what every person watches not just a sampling of people.

They could turn on logging of all watched programs at any time.

Aren't there already people running 100+ Gb Tivos?