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I am developing a mud that uses both coordinates and rooms - though not in the same fashion as what I understand you to mean. My mud will have rooms the same as many of the older style of mud where they are containers that can fall anywhere perse. And then each room will have it's own "coordinates" inside (more like a grid system inside). For me, this will allow portals to a specific "spot" within the room, blocked doorways/passages, etc.
If you mean your entire world is set up in a true x/y/z coordinate-based grid, and the rooms fall on those - as KaVir said most wilderness systems use that. I found many before when I was doing the research for my game. They are not hard at all to implement (well, the bounding system - movement and affect area - was hard for me, but it was probably just me).
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