Press Ctrl + Shift + C to bring up the cheat/dev console.
Motherlode - $50,000
Kaching - Adds $1,000
Moveobjects on/off - Move objects anywhere
Aging on/off - Sims cannot age (those freaks)
StretchSkeleton - Change Sim's height
Vsync on/off - Increase graphic performance (lowers textures)
faceBlendLimits (on/off) - Face stretching is not limited
Help - Lists common cheats
Exit - Close dev window
Expand - Enlarges dev window
boolProp snapObjectsToGrid true/false - Snap/unsnap objects to grid
deleteAllCharacters - self-explanatory
TerrainType desert/temperate - Terrain selection
boolProp simShadows (True/False) - Shadows on or off
boolprop displayNeighborhoodFlora (True/False) - Plants on/off
boolprop displayNeighborhoodRoads (True/False) - Roads on/off