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These cheats were taken from GTASanAndreas.net's news report , EdisonCarter's updated cheat list , the forum thread where on-the-spot discoveries are made and findings announced.
These are both intelligible-word and button-press cheats. As more are discovered they will be added here and their unintelligible button-combo equivalent will be removed from the list below. All these cheats will still work in the meantime.
Cheats in italics have no word-based equivalent (so far) and have not been tested.
LXGIWYL Weapon Set 1, Thug's Tools
PROFESSIONALSKIT
Weapon Set 2, Professional Tools
UZUMYMW Weapon Set 3, Nutter Tools
ROCKETMAN
Have Jetpack
BRAKESPRACTISINGCEREMONY
Have Parachute
AFPHULTL Have Katana (Ninja Sword)
HESOYAM Health, Armor, $250,000
NOCHEAPSKATEBUREAU
Infinite Health
BAGUVIX Infinite Health
FULLCLIP
Infinite Ammo, No Reload
CVWKXAM Infinite Oxygen (lung capacity when underwater
GOODBYECRUELWORLD
Suicide
ANOSEONGLASS
Adrenaline Mode
AEDUWNV Never Get Hungry
PROFESSIONALKILLER
Hitman In All Weapon Stats
PAWNDARBY
Never Wanted
BRINGITON
Six-Star Wanted Level
TURNDOWNTHEHEAT
lower Wanted Level Two Stars
TURNUPTHEHEAT
Increase Wanted Level Two Stars
TESTEDUCATIONALSKILLS
Clear Wanted Level
AEZAKMI Never Wanted
SJMAHPE Recruit Anyone (9mm)
ROCKETMAYHEM
Recruit Anyone (Rockets)
NATURALTALENT
Max All Vehicle Skill Stats
WORSHIPME
Max Respect
HELLOLADIES
Max Sex Appeal
UNDISTURBABLEBELLOWS
Really Fat CJ
KVGYZQK Really Skinny CJ (0 fat and muscle)
BUFFMEUP
Max Muscle
BIFBUZZ
Gangs Control the Streets
ONLYHOMIESALLOWED
Gang Members Everywhere
OHDUDE
Spawn Hunter
AMOMHRER Spawn Tanker Truck
ITSALLBULL
Spawn Dozer
MONSTERMASH
Spawn Monster
FOURWHEELFUN
Spawn Quad
FLYINGTOSTUNT
Spawn Stunt Plane
AIWPRTON Spawn Rhino Tank
DOUGHNUTHANDLEDHANDICAP
Spawn Rancher
VROCKPOKEY
Spawn Hotring Racer 1
VPJTQWV Spawn Hotring Racer 2
OLDSPEEDDEMON
Spawn Bloodring Banger
WHERESTHEFUNERAL
Spawn Romero's Hearse
RZHSUEW Spawn Caddy
JUMPJET
Spawn Hydra
CELEBRITYSTATUS
Spawn Stretch
TRUEGRIME
Spawn Trashmaster
BACKROOMRESISTANCE
Spawn Vortex Hovercraft
SPEEDFREAK
All Cars Have Nitro
BUBBLECARS
Cars Float Away When Hit
CHITTYCHITTYBANGBANG
Cars Fly
FLYINGFISH
Boats fly
FVTMNBZ Traffic is Country Vehicles
BMTPWHR Country Vehicles and Peds, Get Born 2 Truck Outfit
EVERYONEISPOOR
Traffic is Cheap Cars
EVERYONEISRICH
Traffic is Fast Cars
STICKLIKEGLUE
Perfect Handling
ZEIIVG All green lights
LLQPFBN Pink traffic
IOWDLAC Black traffic
GHOSTTOWN
Reduced Traffic
YLTEICZ Aggressive Drivers
WHEELSONLYPLEASE
Invisible car body (wheels visible)
CPKTNWT Blow Up All Cars
JCNRUAD Smash n' Boom (player's vehicle acts like a Rhino tank)
OUIQDMW Full Weapon Aiming While Driving, never fall off bike
VKYPQCF Taxis Have Nitrous, L3 Bunny Hop
BLUESUEDESHOES
Elvis Is Everywhere
NINJATOWN
Ninja Theme
LIFESABEACH
Beach Party Theme
CRAZYTOWN
Funhouse Theme
STINGLIKEABEE
Mega Punch [1]
KANGAROO
Mega Jump
CJPHONEHOME
Huge Bunny Hop
BEKKNQV Slut Magnet
WARNING : do not save with the following codes enabled, they cannot be turned off
FOOOXFT Everyone is armed
AJLOJYQY Peds Attack Each Other, Get Golf Club
BAGOWPG Have a bounty on your head (Peds attack)
BGLUAWML Peds Attack You With Weapons, Rocket Launcher
STATEOFEMERGENCY
Riot Mode
SPEEDITUP
Faster Gameplay
SLOWITDOWN
Slower Gameplay
YSOHNUL Faster Clock
PLEASANTLYWARM
Sunny Weather
TOODAMNHOT
Very Sunny Weather
ALNSFMZO Overcast Weather
AUIFRVQS Rainy Weather
CFVFGMJ Foggy Weather
SCOTTISHSUMMER
Thunderstorm
HITHERSALVATORERIDES
Sandstorm
DEBUGCAMPPEACE
Orange Sky, Clock Fixed at 21:00 (like in the beta screenshots)
NIGHTPROWLER
Always Midnight
According to EdisonCarter's findings, the following cheats were not implemented in the PC version:
Drive On Water
Do Nothing
Hookers Pay You 
