We have been asked to collate together this list. Rather than copying/moving everything into one place, it seemed sensible to collect links to them in one place (if only because any changes don't have to be made in separate threads). Below, then, are the links. If I missed anything, please let me know.
First, Rules of Diplomacy can be found under the RULES tab.
Off-site link to the official published Rules is HERE. These were published in 2000. A later edition exists but it doesn't change the rules at all (and uses much more data): off-site link HERE.
Rules for Variants can be found within this sub-forum.
The following are the site's rules for playing on site NOT rules of the game:
Rules for using PlayDiplomacy.com are found here.
House Rules, defining what is and what is not allowed when playing on the games site, are found here.
Site Rules for Playing Games on the Forum: Rules governing Forum Games and Other Forum Games (with links to specific rules for those forums).
Anonymous game advertising/Needing a substitute: Guidelines on how to advertise an anonymous game or find a substitute player in your game if you are going to be away for a short time.
Some forums have specific rules which are posted within the forum. To view these, simply open the links:
GAMES
BUGS
CHEATERS
STRATEGY
RULES