This is an absolutely fascinating TED lecture about practical used of origami. Also included is the information to download a free program called Tree-Maker which will design the fold patterns for complex projects.
Video: http://www.wimp.com/neworigami/
Program: http://www.langorigami.com/science/treemaker/treemaker5.php4
Video: http://www.wimp.com/neworigami/
Program: http://www.langorigami.com/science/treemaker/treemaker5.php4