its reallt not that hard to find. Go to this address :
http://www.xbox.com/Games/adventure/oddworld.htm
then..if you have flash installed on your computer, you will see a box where you can scroll through pics. At the top of the box, click video, and a library of videos will come up. 2 versions of the short trailer, then 2 versions of the long trailer. The only thing special about the 13 minute one is lorne talks you through a level..which is cool.