If you do a lot of commuting around the DC Metro area and you own an Android phone then you can get this application right here and get quick access to DC Metro maps.
When you run the app for the first time the map image will be downloaded straight to the SD card. After that you can access the app at any time in the future no matter where you are. The application is finger friendly and it will let you scroll and zoom around with a simple touch.
Download DC Metro Map