Doc Searls has a nice photoset of Arlington’s infrastructure as seen from the most infra structure of all, the remains of the rail line that forms the Minuteman Trail. He also points to a blog about the trail that makes for interesting reading.
Doc and his commenters have done a lot of digging on Arlington history, and made some good observations about the town, such as the homemade curbing in many streets (legacy of our “private road” peculiarity).