Nielsen Revamps Web Rankings in Favor of Engagement

The New York Times reports today that Nielsen is dumping page views as the key measurement and will instead use time spent as the yardstick.
The article also mentions how comScore Media Metrix uses site visits, the number of times a person visits a site with at least a 30 minute break in between to address the changes in the way people use the internet.
Since Campfire values persistent engagement over impressions and page views, this change supports our approach, but I am curious to see how more traditional advertisers deal with these changes.
