New York City Subways
Here is another great example from the New York Times of a Google Map created to help illustrate a news story.
Every year, New York City Transit releases a station-by-station breakdown of ridership on the network. This NYT article examines which subway stations experienced a decline in traffic last year and which subway stations experienced growth.
Readers of the New York Times can use the Google Map to query the data themselves. The map gives a great overview of the yearly rises and falls of traffic and users can click on any subway station to view specific traffic data.
The map includes three main views which can be accessed via the menu at the top of the map. You can view a map of where ridership is down, where ridership is up and view the total traffic for the year.
Other New York Times Google Maps