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