Drop the developer console (hit the TILDE key), then enter these codes:

Coinage - +1,000 Platinum 
BlingBling - +10,000 Platinum 
AlllsRevealed - All Campain Missions 
SuperShopper - All Upgrades 
Help - Displays Help 
LayOnHands - Heal All Units 
ManaKing - Inifinite Mana for Unit 
StaminaKing - Inifinite Stamina for Unit 
SirKnight - Knights Gain 1 Level 
LevelLord - Lord Gains 1 Level 
IAmNotTheOne - Lose Game 
Pause - Pauses game 
Omniscience - Removes Fog of War 
Gamma # - Set Gamma to # 
MaxKnight - Set Knights to High Level 
KingMe - Set Lord to High Level 
PowerBurst - Set Troops to High Level 
ManaBoost - Set Units Mana to Max 
StaminaBoost - Set Units Stamina to Max 
MenuBar - Toggles Menu Bar 
LetThemEatCake - Troops Gain 1 Level 
IAmTheOne - Win Game