Oblivions dungeon map faded in as you explored...
And Morrowind's, and Daggerfall's.
Hmmm... Speaking of Daggerfall, who'd be in favor of them doing 3-dimensional rotatable and zoomable interior maps again? Maybe with a bit more fade effects than what were present in Daggerfall.
Twould make sense, considering their decisions regarding displaying inventory as fully rotatable 3d items a la Redguard.