I am working on mapping the floors of Kendall Keep (Return to the Keep on the Borderlands) in Visio. I've got the 'Gatekeeper's Tower (Southeast tower) pretty much done. I'm surprised Visio isn't used more for floorplans like this, I was able to whip something up pretty quickly, and it's to scale. Granted, I've been using it for a while but it's a pretty easy program to use. You can even import your own textures. Anyone else done any mapping with Visio?