Alright, this could become a very big list very soon, so let me start with cheats that some of my friends seem to want...

Most of these cheats can be found at cheatplanet.com, so look there if the cheats don't work, although there's no reason they shouldn't...

Knights of the Old Republic:

First off, you have to locate the "swkotor.ini" file in your game's folder, change it to a .txt file, then edit it w/ notepad. Under the [Game Options] line, add EnableCheats=1. Then you just press the ~ button at the top left of your keyboard and type in any of the following cheats:

heal; setcomputeruse #; setdemolitions #; setstealth #; setawareness#; setpersuade #; setrepair#; setsecurity #; setstrength#; setdexterity #; setconstitution #; setintelligence #; setwisdom #; setcharisma #; addexp #; turbo; invulnerability; restartminigame; bright; addlightside #; adddarkside #; revealmap; givecredits #; giveitem #; givemed; giverepair; givecomspikes; givesitharmour; warp; infiniteuses; whereami; addlevel #; dancedancemalak

Note: #=Any number 10-999

Sim City 4

Press rightctrl+X during game to show console. Enter a code below and press ENTER

hellomynameis <mayorname>-Change name to name you supply

you don't deserve it-Get all rewards free

sizeof <1-100>-Make magnification 1-100

stopwatch-Stop/start the clock

whattimeizit <time>-Set time of day follow with space and time you wish to set

whereufrom <cityname>-Change city name

weaknesspays-Get 1,000 added to treasury

fightthepower-No power requirements

zoneria-Empty zone color hidden

tastyzots- Toggles zots

howdryiam-No water requirements

DollyLlama-causes advisors to have llama heads