These cheats have not been tested all the way, but they seem to work.

-- weapon cheats --

THUGSTOOLS - Weapons/Tools set 1
PROFESSIONALTOOLS - Weapons/Tools set 2
NUTTERTOOLS - Weapons/Tools set 3

-- personal cheats --

PRECIOUSPROTECTION - Armor
ASPIRINE - Health
ICANTTAKEITANYMORE - Suicide
CERTAINDEATH - Walks around with cigarette in mouth

-- wanted level cheats --

YOUWONTTAKEMEALIVE - Wanted level up
LEAVEMEALONE - Wanted level down

-- weather cheats --

APLEASANTDAY - Clear weather
ALOVELYDAY - Sunny weather
ABITDRIEG - Overcast weather
CATSANDDOGS - Raining weather
CANTSEEATHING - Foggy weather

-- ped cheats --

FIGHTFIGHTFIGHT - Peds fight each other
NOBODYLIKESME - Everyone attacks you
OURGODGIVENRIGHTTOBEARARMS - Give all peds weapons
FANNYMAGNET - Attract all girls

-- speed cheats --

LIFEISPASSINGMEBY - Time flies by
ONSPEED - Running speed way faster
BOOOOOORING - On drugs (use onspeed to remove)

-- car cheats --

BIGBANG - Destroy all cars
WHEELSAREALLINEED - Removes car frames
COMEFLYWITHME - Flying car
GRIPISEVERYTHING - Better handling
GREENLIGHT - Make all traffic lights green
MIAMITRAFFIC - Crazy traffic
AHAIRDRESSERSCAR - All cars pink
IWANTITPAINTEDBLACK - All cars black
SEAWAYS - Drive on water

-- cars --

PANZER - Tank
TRAVELINSTYLE - Bloodring banger
THELASTRIDE - Hearse
ROCKANDROLLCAR - Love Fist Limo
RUBBISHCAR - Trashmaster
GETTHEREFAST - Sabre Turbo
BETTERTHANWALKING - Golf cart
GETTHEREQUICKLY - Bloodring banger
GETTHEREVERYFASTINDEED - Hotring racer
GETTHEREAMAZINGLYFAST - Hotring facer

-- costumes --

LOOKLIKELANCE - Lance Vance
MYSONISALAWYER - Lawyer
ILOOKLIKEHILARY - Hilary King
ROCKANDROLLMAN - Love fist
WELOVEOURDICK - Lovefist 2
ONEARMEDBANDIT - One armed bandit
FOXYLITTLETHING - Mafiosi Daughter
CHEATSHAVEBEENCRACKED - Diaz
IDONTHAVETHEMONEYSONNY - Mafiosa

-- Not Even sure about these.. --

CHASESTAT - ?
CHICKSWITHGUNS -
LOADSOFLITTLETHINGS - ?
AIRSHIP - ?
HOPINGIRL - ?
STILLLIKEDRESSINGUP - ?
DEEPFRIEDMARSBARS - ?
PROGRAMMER - ?