Press Enter and type these codes:

abracadabra      All spells, full mana
alchemy          999,999 Gold 
alreadydead      God Mode 
dummies          Disable enemy AI    
debug            Debug mode - press F12
gimmesomegrub    More food
nahkranoth       One hit kills
noamnesia        Raise character to level 30
potionsnlotions  More potions

Thanks to Revolution readers TJ, Jon Hinkel and Smokey!