Hubway is a bike sharing system in Metro-Boston launched in July 2011 with 60 stations and 600 bicycles. Users pay a membership fee which allows them to check out a bike at one station and return it at any of the other stations. Recently, Hubway released data for all trips from the system launch on July 28th, 2011, through the end of September, 2012 as part of their The Hubway Data Visualization Challenge.
The data is geographic consisting of station points and trip lines with associated rider and trip attributes. Take a look at this visualization created with Neo4j a graph database. Make sure to click on the image and then hover around.
Here is the original post by Max de Marzi