here, check these out :
http://www.wonderlandblog.com/wonderland/2005/05/nerd_origami.html
http://paperstarships.tengun.net/
This guy figured out how to fold a Viper :
http://www3.sympatico.ca/draken35/draken/origami.html
Origami Millenium Falcon
http://gizmodo.com/5120174/how-to-origami-millennium-falcon