Jeffe Koppe describes his efforts in building an Aztec Gateway.
Republished by Blog Post Promoter
In the Jungle is an interesting set of rules for conquistador vs aztec games. It's played on a gridded board and is supposed to simulate a group of "lost" conquistadors trying to find their way to a temple without falling victim to sacrifice.
The Conquest of Mexico is a period I've always wanted to game. Steve's Balagan website has a very useful web page of information and links to resources on the Aztecs and other inhabitants of Mesoamerica.