Here's another look at my Tombs mapping project, which is getting pretty well along. Right now I'm struggling with the best way to deal with secret doors in the virtual map world. Obviously there's information on the map that players shouldn't see right off. I know most of the virtual tabletops support fog of war and/or line of sight, as well as layers. I'm just trying to make it as easy as possible for someone to actually use this as a GM.
I think I'm convincing myself that just hiding the secret doors markers is the right way to go.