Since no such app exists I propose that either a private entity or google maps takes on this idea. The basic story is I was with my friends in the car yesterday without a street directory trying to find where to go. With no open wifi around we had to guess. If I had an app that was like a street directory it would have been a life saver. Of course you wouldn't need an offline map of the world, just a map of your own local area or city. Idea: I think Google should implement a draw and capture technology into the Google Maps, where you simply drag a square around the area you are interested in and it saves all the images for that area offline. What would be awesome is if you were still able to access the directions function so that a route between two points of the offline map could be established.