I thought it would be a good idea to offer a map of Asia Minor (modern day Turkey). You will see from this map that the seven cities of the Apocalypse are in somewhat of a ring. Many scholars believe that the order of the messages to each church indicated the route in which the messenger would have taken to deliver the letter. In other words, the order represents the main communication router of the time.
Due to the lack of detail that a small map can provide (and the limited screen on this blog), here is a link to the map courtesy of Bible History Online.