This is a video codec based on an integer wavelet in 3 dimensions (x, y, and time/frame). What documentation exists so far is on the vorbis-dev and (now) tarkin-dev mailing lists at xiph.org. Some brief documentation can be found in the w3d/docs directory. For sample / test streams, see http://media.xiph.org/ (and feel free to submit more streams if you have them).