I'll write a list of games I'd also recommend for co-operative games on PC.
RPG:
Baldur's Gate 1 + 2
Neverwinter Nights 1 + 2
Diablo 2 + Expansion
Lionheart _ Legacy of the Crusader (Couldn't get Multi working but would recommend)
Dungeon Siege + Expansion
Dungeon Siege II (Couldn't get it working! Very annoying as I loved single player)
Icewind Dale
Magicka
Mount & Blade Warband
Nox
Dungeon Lords
Shooter:
Killing Floor
Left 4 Dead 1 + 2
Counter Strike Source (VS Comp)
Arma II
Rainbow Six 3: Athena Shield (Terrorist Hunt)
Portal 1 + 2
Doom 3 (Mod)
Half-Life 1 + 2 (Mods)
RTS:
Starcraft 1+2 (VS Comp)
Warcraft III: Reign of Chaos + Expansion (VS Comp + Mods)
Red Alert 1 + 2 (VS Comp)
Age of Mythology + Expansions
Age of Empires + Expansions
Men of War (Haven't played Vashyo mentioned)
These are some co-op games we have played. I'm looking for something brand new and awesome that I've not really experienced before. I'll add to the list if people recommend any more co-op games.
