Thought some of you may be interested in this program. I just downloaded it today, and it's pretty slick.! The latest version is shareware, with a 30 day expiration. You can also download an older version that is freeware. You will also have to get a vrml viewer, and there are links on the site to freeware versions. This may be handy for doing interior layouts, as you will get a complete walkthru to visualize before you build. The newest version has an object builder that will allow you to build and save your own components.
Hope you find it useful!
http://www.roomarranger.com/index.html
Russ