Now you can learn to make paper airplanes from a guy who has set world records with his planes. Ken Blackburn has a website with his preferred patterns for folding paper airplanes.
Blackburn is an engineer for the Air Force, holds the world record for longest paper airplane flight, and owns a horse. So naturally, most readers here will regard him with envious hatred. For those wanting a chance to emulate his lifestyle, he has a site where he gives out some of his secrets. (Paperclip weights feature greatly in most of the designs.)
He also has video of his airplane's record-breaking twenty-seven second flight.