Bike share in math class

The bike share program is new here in New York, but I know its perfect for math class. Not only can we model cost based on time and distance, but New York is sharing all of its data in beautiful interactive charts.  I could spend an entire lesson just talking about the story behind each graph. I love that you can toggle through all types of data:

More than that, you can download the raw numbers and play with them on the data software of your choice. The link to the raw data is on the bottom right of the screen:

Boston seems to have set up a competition at visualizing the data behind their bike share program.
With these two examples, I am wondering what else we can find.