I recently wrote a tutorial on Instructables on how to 3D scan your room, and it actually pretty easy, though a bit expensive. All you need is a Kinect, a Mac, and optionally the pro version of Skanect. I took some videos (which I converted to GIFs) for the Instructable, which showed what to do and what not to do. The Instructable actually got featured, too! I entered it into a contest (hosted by Microsoft!), and I have high hopes for winning at least one of the runner up prizes.
Plus, projects that use certain Microsoft products (including the Kinect) may get a special prize!