Press "t" while playing, then enter one of the codes:
jediwannabe on: enable God mode
jediwannabe off: disable God mode
red5: get weapons
wamprat: get items
eriamjh: enable Flight mode
5858lvr: reveal map
deeznuts: skip level
pinotnoir x: get to level X
slowmo on: slow motion
slowmo off : normal speed
thereisnotry: end level
bactame: get health
yodajammies: get mana
imayoda: Light Master
raccoonking: force powers
sithlord: Dark Jedi
white flag on: disable AI
white flag off: enable AI