http://www.youtube.com/watch?v=X0axbNYviOw&mode=related&search= found this vid on youtube and thought it was a good fan made trailer to post and show everyone.
I believe those are just clips from a short film called S.E.E.D. I have it on my computer but i cant seem to find the fan site of the guys who made it. Either way, the whole thing is about 20 minutes long.