Unzip and add the contents to iPhoto. Then create a photo album (named “Berlin Subway Map”) and fill it with the images in numeric order. To do this in one step, unzip and drag the folder onto the albums sidebar area in iPhoto. Then in iTunes, ensure the new photo album is synced to your iPhone or iPod Touch.
The Berlin transit system is incredibly large and complex. The type in this map is as small as possible, at the limits of legibility. Second, because of the legibility constraint there is no page overlap. I needed as many unique pixels as possible to cram the map in. I’d consider doing a version of just Berlin’s core A transit zone if there is desire. Also, use at your own risk. This is based on the latest map (as of December 2007) I could find. Stations change, remember to do a reality check!