You heard it here first: I predict that google maps will spawn a wave of large scale art (like this, courtesy of google sightseeing). Subversive farmers the world over will start plowing their messages into our fields of vision.
I also predict that it will spawn a whole new kind of large scale advertising. In two years you'll be dragging your way through midtown (to see if you can spot your friend's apartment building, or some such masturbatory task) and find the rooftops littered with ads for shaving cream and pain killers. Trust me.