I found this on Gizmodo, one of the tech blogs I read. To steal the description from Gizmodo, it's like the modern day Holodeck from Star Trek TNG. This is a really neat video, and I would love to have something like this for designing some of my ideas for houses, cars, and even video game worlds. It takes a minute to get going, but it's a cool video.
World Builder from Bruce Branit on Vimeo.