I love when companies release their data into interesting visualizations. Last.Fm’s Best of 2009 takes the trend data of users to compile their top 100 list. They also superimpose your scrobble activity on top of it to see how you’ve trended compared to the aggregate. I just start to imagine when all these data houses hook up to each other… the singularity anybody? 
If not the singularity then at least it will help some people get really good at predicting the future and really rich at the same time.
(Update) Fun visualization of music New Yorkers listen to compared to the World. (looks pretty accurate )
