Press T to get to the console, and type in the code for the desired effect. Codes in red require a switch after the code (1 for "on" and 0 for "off"). For example, boinga 1 turns on invulnerability.

iamagod - Uber-Jedi (you get all Jedi powers)
diediedie - all weapons
gimmestuff - full inventory
gameover - skip current level
statuesque - freezes the enemy
trainme - force level up
freebird - fly mode
boinga - invulnerability toggle
trixie - refill force power
cartograph - show full map
gospeedgo - slow-mo mode