AR Media provides a free authoring plug-in, with limited functionality, it doesn't cost much more to take it up a notch. Jim's site has big button on the left of his logo to download his demo kit. AR has more demo files on their site too.
Here's a photo of paper "plans" (printed and cutout) for hotel rooms on a table (printed out and placed by hand), like cutouts that you can move around to experiment with the best arrangement.
Then you can run the AR tool to see how they work in 3D too.
I'm not sure if Jim is planning to include it during the Glorious Gadgets session at RTCUSA or not, but sure looks like a candidate to me.
Watch this video for a quick demo too.