Hit ENTER during the game, and enter the following:

Result                                Code 
------------------------------------------------
1000 food                           - cheese steak jimmy's
1000 gold                           - robin hood  
1000 stone                          - rock on  
1000 wood                           - lumberjack  
Cobra car                           - how do you turn this on  
Control nature                      - natural wonders  
Destroy all opponents               - black death  
Fast building                       - aegis  
Flying dogs                         - woof woof  
Full map                            - marco 
Instant loss                        - resign  
Instant victory                     - i r winner  
Kill Opponent 1                     - torpedo1  
Kill Opponent 2                     - torpedo2  
Kill Opponent 3                     - torpedo3  
Kill Opponent 4                     - torpedo4  
Kill Opponent 5                     - torpedo5  
Kill Opponent 6                     - torpedo6  
Kill Opponent 7                     - torpedo7  
Kill Opponent 8                     - torpedo8  
Little monkey                       - furious the monkey boy  
No fog of war                       - polo  
Saboteur unit                       - to smithereens  
Suicide                             - wimpywimpywimpy  
Tall, fast moving, useless villager - i love the monkey head  
aegis                               - your buildings will be constructed