Little Samson is awesome. Tragically, it's not available.
City Transport Map
DSi Points: 500
2009-01-28 
2009-08-07 
2009-08-07 Scroll around the maps easily with the Touch Screen and Stylus, and search by line or station name. But that’s not all. Drop markers onto favourite places, or attach a handwritten note to an interesting location. Snap a photo with the camera and pin it anywhere on the map – perfect for travelogues. Or take the Route Quiz and test your city transport knowledge! Note: All the lines and station names in this software are correct as of June 2009. This also includes announced changes to lines or stations and changes to be made in the near future.