Press [ENTER] while playing to bring up chat box, then type:

Code Result 
ROCK ON 1000        Stone 
LUMBERJACK 1000  Wood 
ROBIN HOOD 1000   Gold 
CHEESE STEAK JIMMY'S 1000 Food 
MARCO                    Reveal Map 
POLO                       Remove Shadow 
AEGIS                      Fast Build 
NATURAL WONDERS Control Nature 
RESIGN                   You Lose 
WIMPYWIMPYWIMPY Destroy Yourself 
I LOVE THE MONKEY HEAD Gives VDML 
HOW DO YOU TURN THIS ON Gives a Cobra car 
TORPEDO#             Kill Opponent # 
TO SMITHEREENS  Gives a Saboteur 
BLACK DEATH       Destroy All Enemies 
I R WINNER             You Win