Suggestions please: (PC Co-Op/Multiplayer games)
 

I need new or old online games, So far I'm running out of things to play with my friends.
Looking for just about any Muliplayer games, but if you have a MMO in mind, please no WoW type games.
What I have already is:
Brink
Section 8: Prejudice
Portal 2
DarkSpore
Magicka
Minecraft
Borderlands
Global Agenda
and most other main stream FPS's

Gladly take any suggestions, even games that are not out till later this year or older ones I may have over looked.

Thanks in advanced, if I find any of the suggestions exceptional I may be included to gift a steam game in return no promises as I have very high standards to the title "exceptional"

Left 4 Dead

Can't go wrong with cs.
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Team Fortress 2

diablo 3

GTA IV with mods

GTA SA-MP

Hunted: The Demon’s Forge seems pretty good. I pre-order it.
Dragon Age and Dragon Age2 is also very good.

league of legends

Mass Effect is the shit, as well as Dead Space 2, Fallout New Vegas, Mafia 2, Battlefield Bad Company 2, Crysis 2, and Splinter Cell Conviction!

I came here to say Diablo 2. =3

best co-op game ever!

Heroes of Newerth

i reinstalled d2 a month or 2 ago b/c i missed it. bot really ruined the game. i hope they do something about it in d3

+1 for CS

if it ain't CS it's BS!

Alien Swarm
(it's free)

Vampire Slayer

what bots? =/ I don't remember any bots 8 yrs ago!!

Bots that sit in channel and/or go into random games to spam their websites and advertisements. Yes they real the ruin most definitely...

Dota
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not only that, but ppl use bots to do baal runs where basically you get to act 5 and hop on these runs to treasure hunt and level up. so basically no one really plays the game anymore they just go on these free baal runs to get to level 90 fast.