We're recently made our 2.4 mile (3.8km) Manchester: Then & Now tour completely free - for good.
The audio downloadable tour is available in MP3 format and can be played on iPods, iPhones, smart phones, MP3 players and other devices with MP3 playing capabilities.
The tour offers descriptions of "some of the key socio-economic developments and personalities responsible for shaping Manchester's past and present".
Check out their blog for more info.