I call these campaign maps, they are 9 x 9 panels put together into a single map. This allows dungeon masters and players to get a good idea at the scope and complexity of the underground world. Currently the maps are at 200 dpi however I will probably be working on doing them at 300 dpi before long. I figure you never know what printing needs might come up and you can always go down if needed for like on the web.
Currently these maps have no labels, names or any markings related do gaming systems so you can use them for 1e, 2e, 3.5e, 4e dungeons and dragons or any other game you desire. You can also use NPC Designer - 3.5e NPC Generator to handle your needs for fleshing out the map.