Open the "civ4config" file found in your Sid Meire's Civilization IV install directory (Default is "C:\Documents and Settings\Owner\Application Data\Firaxis Games\Sid Meier's Civilization 4") find "cheatmode = 0", change it to "cheatmode = chipotle". During any game, open the console by pressing the tilda key "~", and type in one of the following then pressing enter.

Code	Effect
Console.Clear	Clear the console
App.crash	Crashes game
Game.showWBPalette bool bCreate	Debugging
help	Displays all console codes
Console.History	Dump console command history
Game.AIPlay [turn #]	Forces AI to plat a certain number of turns
Profile.morphGlobe [integer]	Morph the globeview count times.
Profile.rebuildCity [x coordinate], [y coordinate], [integer]	Rebuild city indicated number of times
Profile.rebuildPlot [x coordinate], [y coordinate], [integer]	Rebuild plot indicated number of times
Graphics.ReBuildTerrain	Rebuilds terrain and lighting
Xml.reloadArtDefines	Reload Civ4ArtDefines.xml
Xml.reloadLandscapeInfo	Reload Civ4TerrainSettings.xml
Xml.reloadGameText	Reload Game Text xml files
Sound.reload	Reloads audio scripts
Graphics.SetHillScale [number]	Sets hills' scale
Graphics.SetPeakScale [number]	Sets peaks' scale
Player.setGold [player #], [amount]	Sets players gold (0 is active player)
Sound.noMusic	Stops music
Sound.stopSoundScape	Stops soundscapes from playing
Game.toggleTextureAccessInfo	Toggle output of texture loads/accesses to debug output
Console.CreateDocumentation [filename]	Writes HTML documentation for the current console commands