A book pulished by the Association for Public Transportation, currently in its third edition. It contains maps, schedules, station-specific exceptions, destination information, and other transit-related things for Boston and surrounding areas. It lists good bike routes, and has full maps of the T and commuter rail. The commuter rail map is especially cool, because as I recently found out, the MBTA no longer publishes these. The book even mentions the budget buses to New York City, most notable the Fung Wah Bus.