...is right here:
http://www.xboxyde.com/news_437_en.html
You need BitTorrent in order to download the file, so get a Bittorrent client like burst! before attempting to download it. But it is oh so worth it.
It depicts a japanese player going through the Ninja Gaiden demo (The demo is coming in the next Official Xbox Magazine, the demo has been out in japan for a while), in a very flashy way. If you're a fan of ninja gaiden at all, this is the video that seals the deal and will cost you the 50bux for the game.