Yesterday, while just browsing through reddit, I found an interesting piece about making a fantastic paper plane. The link is http://www.zurqui.co.cr/crinfocus/paper/air-bld1.html
Go try it out. I will try it myself sometime.
While we are on the subject of airplanes, here is an amazing video I found. It is a radio controlled plane flown with superb skill, to say the very least.