Many things have already been mentioned, but how about the "never ending game" (the longest running one ... has it ended yet???)
Woodruff.
Bk's recent "security" thread.
The creation of the first truly unique maps -- Fuedal, Age of Merchants, etc.
dice changes
creating Trophies and medals
the original banning of snorri, et all for using each other's accounts to post in forums and subsequent rule changes.
Widowmaker's Creation thread (even though a lot of the original post has long since been deleted)
