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It's called Half-Life:Decay. It's basically a version of Half-Life especially designed to be played with two players CO-OP. In fact even when you play it single player you have to switch between the two characters in order to progress. I have my Half-Life cd key registered with Steam and the steam edition of Half-Life with HD models added on especially waiting for this mod to come out. It's actually a port of an expansion pack to the PS2 version that hadn't been back-ported to the PC up until now. If any of my friends on my friends list happens to have Half-Life and would like to play this game with me when it comes out leave me a comment\message\what have you. I read their forums and they said they are 60% done with the last level.
