Home-built 747 Simulator
James Morris writes: "This is a cool hack: some guy is building a 747 simulator in his backyard." This is one of the most impressive even while in progress, but the other projects linked from this site set a tough standard.
Google's cache r00lez
Engage!
The guy at http://www.737simguy.com/ (linked off the site in the article) actually built his sim in the severed nose of a real airliner. Now that's dedication to realism.
Must be expensive though...
Behold the Power of Cheese!