This stuff has been around through several versions of Carrara.
It is a cool way to present something to a client...
My sample is simple, but you can do walk-through houses, tool details, whatever and it works with animations too.
You have to have the plug-in for your browser, but the authoring part is included in Carrara
Sample here: http://www.nateowens.com/vettests/vettest.html Get the browser plug in viewer here: http://www.viewpoint.com/technologie...layer-3d.shtml
I've also had "Enliven" for ages, but haven't had the time to learn how it works.