Behold the Paperang, the "Stealth Bomber" of paper airplanes, made by Dr. Edmond Hui.
Includes construction photos, although the detailed instruction will cost your $10. Link - via Ursi's Blog
Updated 3/23/07: It's $10 for a printable PDF. Otherwise, you can download a non-printable PDF for free. - Thanks Ed!
Ed Hui
(Inventor)