Tikal - Rules Summary, version 3
This documents contains a summary of all of the rules of the game. Print it out (I prefer double sided), laminate it and slip it into the box. The rules are already pretty simple and the player aids help, but I find this document helps clear up questions easily. It incorporates information from the FAQ, especially dealing with the last scoring turn.
Note: it does not include the Auction Variation, which I have never used.