The name 'Charles Akawele' for an archetypal Nigerian spammer is a Running Gag.
419 Scam: Often referenced due to similar scams being attempted by spambots invading the forum occasionally.
Tropes appearing in AH.com board culture include:
Worldwar: War of Equals, an adaptation of a thread called Race 2012 Invasion map game.
Weber's Germany: The Veterinarian Totalitarian.
To Rule Them All: A Lord of the Rings ISOT.
Star Wars: Galactic Folklore and Mythology.
Piecing Together the Ashes: Reconstructing the Old World Order.
Philippines and the Three Renegade Countries.
No Man's Land: Tales from the Weird Wars.
The Navatlacas: Heirs to Hernan and Montezuma.
Mass Effect Co OPA Voyage To The Galaxy.
Magic, Metahumans, Martians and Mushroom Clouds: An Alternate Cold War.
The ISOT'd House: One Woman Goes from 2012 to 1952.
Holding Out for a Hero: Gustav Stresemann Survives.
Hammer's, Sickle's, and Mushroom Clouds.
The Fountainhead Filibuster: Tales from Objectivist Katanga.
A Fictional History Of The United States.
Fear, Loathing and Gumbo on the Campaign Trail '72.
An Examination Of Extra Universal Systems Of Government.
Canadian Power: The Canadian Forces as a Major Power.
British Imperialism of the 19th Century.
America's Stepbrother, America's Enemy V2.0.
The American Dream: An American Officer ISOTed to the Revolutionary War.
An Alternate History of the Netherlands.
Works from this website listed here:Note that many of these timelines and scenarios (whether fully finished or not) are quite grand examples of Archive Panic.