Best 360 game: Fallout 3
Best 360 only game: Gears 2
Best PS3 game: Fallout 3
Best PS3 only game: MGS4
Best Wii game: SSBB

Best action game: GTA IV (runner up: NGII)
Best fighting game: SSBB (I didn't play any other fighting games this year)
Best RPG: Fallout 3(runner up: Fable 2)
Best shooter: Gears 2(runner up: R6: Vegas 2)
Best music/rhythm game: Rockband 2
Best platform game: Castlevania: Order of Eccleasia for DS (runenr up: PoP)
Best multiplayer game: Gears 2, thanks to horde (runners up: COD: WaW, Castle Crashers)
Best racing game: Grid (also didn't play many racing games)
Best sports game: Madden 09 (runner up: NHL 09)
Best strategy game: Civilization (runner up: Endwar)
Best XBLA/PSN game: Castle Crashers (runner up: Braid)
Best artistic design: Fable 2 (runner up: PoP)
Best use of technology: MGS4
Best sound: COD: WaW (runner up: Castle Crashers)
Best voice acting: MGS4 (runner up: GTA IV)
Best story: MGS4 (runners up: GTA IV, Fallout 3, and Fable 2)
Best New IP: Dead Space (runner up: Left4Dead)
GOTY: Fallout 3 (runners up: Fable 2, Gears 2, MGS4)

GTA IV will obviously win every major website/magazine award, despite the game being trash.

MY favorite is Fable II, but that will never win anywhere.

Burnout Paradise for best game period.   Screw those other pretenders.

Fable II won G4's GOTY.  Everyone forgot about GTAIV a month after it was released. GTA is still just a bunch of mediocre games combined to make one big game.

Best PSP game: Crisis Core: Final Fantasy VII
Best 360 only game: Gears 2  
Best PS3 only game: MGS4 
Best Wii game: SSBB 

Best action game: Ninja Gaiden 2 
Best fighting game: SF II HD 
Best RPG: Shocking, I didn't play any, I played the Valkyria Chroincles and that was sweet, though it is a SJRPG
Best shooter: Gears 2 
Best music/rhythm game: Patapon
Best platform game: Prince or Persia
Best multiplayer game: Little Big Plannet 
Best XBLA/PSN game: SF II HD
Best artistic design: Prince of Persia 
Best use of technology: MGS4 
Best sound: COD: MGS4
Best voice acting: MGS4 
Best story: MGS4  
Best New IP: Little Big Plannet
GOTY: MGS4

Best 360 only game: Gears 2  
Best PS3 only game: MGS4 

Best action game: GTA IV
Best RPG: Fallout 3
Best shooter: Gears 2 
Best racing game: Burnout Paradise
Best XBLA/PSN game: SF II HD
Best  MMORPG :WOW Wrath of the Lich King

GOTY: ???

Best Wii game: SSBB
Best 360 game:  Gears 2
Best PS3 game: Motorstorm: PR


Best action game: GTA IV PC (console versions are poor)
Best fighting game: SSBB
Best shooter:  Crysis Warhead
Best music/rhythm game: Rhythm tengoku DS
Best platform game: LittleBigPlanet.
Best multiplayer game: SSBB, Motorstorm: PR, Left4dead
Best racing game: Motorstorm: PR
Best sports game: Wii Pro Evo 2008 (by Far)
Best XBLA/PSN game: SF II HD (but even thats poor)
Best artistic design: LittleBigPlanet.
Best use of technology: SSBB, Crysis  Warhead
Best sound: SSBB
Best voice acting: GTA IV
Best story: GTA IV
Best New IP: LittleBigPlanet.

GOTY: GTA IV PC (closely followed by Motorstorm: PR)

Best PSP game:      Crisis Core: Final Fantasy VII
Best 360 game:      Gears of War 2  
Best PS3 game:      MGS4 
Best Wii game:       Brawl  

Best action game: Gta4 
Best Racer: Motorstorn PR
Best shooter: Left4Dead
Best music/rhythm game: Rock band [2008 in europe bitchs..]
Best platform game: Mirrors Edge
Best multiplayer game: Little Big Planet 
Best XBLA/PSN game: Wipeout HD
Best artistic design: Prince of Persia 
Best Tech: MGS4/Gears2 
Best sound: Dead Space
Best story: MGS4  
Best New IP: Little Big Planet
Biggest Disapointment: Far Cry 2

GOTY: MGS4

[left out fighter and rpg as i have played no 2008 titles this year]

(Based only on games that I played)

Genres
:Action/Adventure: Saints Row 2

:Racing: Motor Storm Pacific Rift
:Platformer: Little Big Planet/Banjo Kazooie Nuts N Bolts (for $25 this game is great fun!)
:FPS: CoD WaW (Bleh...)
:RPG: Fallout 3
:Shooter: Gears of War 2
:Puzzle: Echochrome
:Music: Rock Band 2

GOTY
:PS3 GOTY: Little Big Planet

:Xbox360 GOTY: Fable 2
:Wii GOTY: ...
:Overall GOTY:  Fallout 3

MISC
:New IP: LBP (Dead Space pretty close)
:Sound: Call of Duty World at War (despite the odd running sound...)
:Story: Saints Row 2 (only game I've finished so far) but all things considered this one surprised me with its quality
:Biggest Letdown: Call of Duty World at War followed by MGS4 (oh yeah I said it!)

Gears of War 2 easily wins it for me

Sorry that's too much for me, here's my top 5:

1) GTA4.  You lot have terrible memories and expected I don't know what.  This game delivered the best open city we've seen so far, the best GTA storyline and characters so far, and finally properly nailed multiplayer.  Defines the series for me.

2) Gears of War 2.  Just like the first one, but better in every way.

3) LittleBigPlanet. Entertaining platforming, but online co-op and of course the level design makes this my favourite new IP this year.  The fact that's the game looks absolutely stunning and Stephen Fry narrates made this easily my favourite PS3 exclusive of the year.

4) Fable 2.  For some reason, I was happy to pull pints for virtual bar flies for hours, but the world Lionhead created is the perfect antidote to cliched fantasy settings.  A great sense of humour delivered with a multitude of options for character development make this one of the few games I played through twice.

5) Fallout 3.  I think it was fair to call this Oblivion with guns, but for me that was no bad thing.  A good story, with plenty of entertaining side quests meant I had a lot of fun with this.  It was a shame it ended rather abruptly!