I like dark games with depressing tones, similar to Fahrenheit, Still Life, or BioShock. The genre really doesn't matter to me, as long as it isn't an RTS. I am primarily looking for PC games, but feel free to recommend pre-current gen console games as well (I got out of consoles after last gen - I own nearly every one aside from PS3 and 360.)

Thank you to everyone for all of your wonderful suggestions. I picked Still Life up from GoG earlier today and have been playing that. Absolutely loving it so far. I plan to pick up almost all of the games mentioned in this thread, and will be picking Scratches up after I finish with Still Life!

I've been looking up the games as you guys have been posting them, and so far, I'll be picking up The Path and Cryostasis on Steam. Going to look around and see where I can get Undying, System Shock 1&2, and Fahrenheit. Fahrenheit really does look exactly like what I am looking for.

As for Demon's/Dark Souls, I already own both :P Great games.

I know it is rather odd, but I honestly love games with stories that have a depressing mood about them. Games with stories that revolve around murder, loss, fear, or heafty moral choices.

Some games that I enjoyed that fall under what I am looking for:

Condemned
BioShock
Amnesia
Silent Hill (Series)
S.T.A.L.K.E.R. (Series)
L.A. Noire
Max Payne 1 & 2
Call of Cthulu: Dark Corners Of The Earth
Penumbra (Series)

While I am primarily looking for PC games, games on GameCube, PS2, PS3, or any handheld system will be fine as well. I am fine with all genres.