Favorite Game Music

Deus Ex: Human Revolution.

Goddamn.

Tropico.

There's too many to choose from..
For example:
The Gothic series (2+3 especially)
Trine
Icewind Dale
Arcanum
Morrowind
Assassin's Creed 2
...

amnesia ost

http://www.youtube.com/watch?v=n_a4Ap_Mw9Q

Samurai Warrior Usagi Yojimbo without a doubt

mw2 and bit trip runner

braid, dear esther, mafia ii and many other i can't think of right now

Metal Gear Solid

Tales of Symphonia

Tales of Vesperia and probably every game form "Tales of" series.

The Legend of Zelda.

I'm just going to tell these ones now :P

EDIT: Forgot Minecraft and Dustforce O_O

Max Payne 1 and 2.

I just like main themes :P
Altered Beast and Bionic Commando (the 2009 one has a nice version of that one :D)

all Assassin's Creed.

Machinarium, VVVVVV, GTA Vice City, Need for Speed Hot Pursuit 2, DOOM, Fallout 1 & 2.

mafia2 ofc and Assassin's Creed [all parts]

Some of my favorites;

Advent Rising - Greater Lights
Alan Wake - The Poet and the Muse
Anno 2070 - Closer to God
Apache Air Assault - Main Theme
Batman: Arkham City - Main Theme
Bioshock 2 - Two Cents to Dance
Blazing Angels - Main Theme
Bulletstorm - Main Theme
C64 Orchestra - Myth
C64 Orchestra - Supremacy
Conquest: Frontier Wars - Terran Theme
Crimson Skies - Main Theme
Culpa Innata - Main Theme
Dead Island - Who do you Voodoo, Bitch
Deus Ex: Human Revolution - Icarus
Emperor: Battle for Dune - Ride the Worm
Fable - Oakvale
F.E.A.R.: First Encounter Assault Recon - Intro Theme
Freedom Fighters - The Battle for Freedom
Halo - Under Cover of the Night
Homeworld - Adagio for Strings
King's Bounty: The Legend - Under the Shadow of the Oak
Mass Effect 3 - Leaving Earth
Mass Effect 3 - An End Once and for All
Metal Gear Solid 2: Sons of Liberty - Main Theme
Prince of Persia: The Sands of Time - Tower of Dawn
Rage - Apophis
Resident Evil 3: Nemesis - Credits Theme
Sanitarium - The Innocent Abandoned
Silent Hill 2: Restless Dreams - Promise
Silent Hill 2: Restless Dreams - Theme of Laura
Sins of a Solar Empire - Advent Theme
Tomb Raider: Legend - Main Theme
To the Moon - Everything's Alright
Universe at War: Earth Assault - Divine Intervention
X Superbox Trailer - Theme

Beat Hazard (default songs).

Dustforce OST- Fastfall by Lifeformed :D goyt it on the indie game music bundle :D

I agree with you, spyro, crash and oblivion. terraria has some good 8-bit music too :D

Mass Effect!

I like tons, way too much to list, so I'll post what I've been listening to lately

Krater Title Track (the soundtrack is missing the awesome song that plays during the final fight Q_Q)
Oil and Sweat - Sol Survivor Soundtrack
Flip a Switch - Quantum Conundrum Soundtrack

The Halo Theme

Hitman Series
Baldur's Gate Series
Deus Ex Human Revolution

Titles with best examples. Of course, whole OSTs rock still. These games rock still.

Earth 2150 series Eurasian Dynasty War Theme 1
Evil Islands - Battle
G-Police - Mission Failed :)
Grand Theft Auto - Head Radio
Heroes of Might & Magic - Sorceress Town Theme
Incoming - Main Theme
Seven Kingdoms - Viking Theme
The Settlers III - Egyptian Theme

And many others fantastic games from my childhood.

Forgot to mention Terraria. Great game, great music. Shame it died.

Final Fantasy Tactics had an awesome OST

Definitely music from BioShock - it fits perfectly, making great atmosphere of these days. From non-radio soundtrack, I really love "Pairbond" which is BioShock 2's main theme. Simply beautiful...
Another music that I like is soundtrack from VVVVVV, which is really good game with really good music.
Last OST that I recommend is music from American McGee's Alice, which I recommend. Tracks are disturbing, creppy, filled with madness, disharmony.