Visualizing Foursquare Checkins across venues

I was curious to see what checkin data looks like when aggregated across multiple venues of the same type. I put together this site which has some pre-configured venue-sets and depending on the URL used, they can either be viewed independently or be compared across multiple ones.

 

http://sameerhalai.com/projects/checkin/venues/aaplstorenearmsft/msftstoreall/