At the very least, being able to get identical maps would have a lot of potential, and make Dungeon of the Day a whole lot cooler/fair/less scummy. Although to have it work for DoD without everyone being online at the same time doing it would mean it would have to be something like the map being generated based on a number. Actually, I have no idea how viable/ridiculous this is, but could you make it randomize 1000 pre-set maps for every dungeon each day (online somewhere), and then have the play enter a number and have it pull that map? That way we could just say the DoD is dragon isles #376 or whatever. Probably ridiculous, but I've seen another (albeit much simpler) game use this technique, or something along these lines.
I speak chaos.