Look out for charts from this site coming to a powerpoint deck near you soon.
Tracking and ranking of how widespread different videos have become on the web
Like this one for the Slumdog Millionaire film trailer. (Like so many things, the film is good, but not as good as the hype.)
I particularly like the use of Sparklines on the Top 20 ranking pages.
Probably best not to compare traffic for your expensively engineered viral campaign against the number of hits for anything with kittens in it though.