In honor of the 10th Anniversary of Grim Fandango, the game's creator, Tim Schafer has released a puzzle/design document, which is kind of like a proof of concept sort of thing. It's packed full of goodies and is sure to make any Grim Fandango fan squeal in delight. You should be able to download it via this quickie link. I guess I should warn that it is full of spoilers as well. I should also add that LucasArts has for, whatever strange reason, already cracked down on this.

I know this is old but does anyone have the document? It 404'd

http://www.sendspace.com/file/s7fqh4

Bam!