Sven Co-op, a modding community for all that is Half Life (and now Source) have announced plans for a simple co-op mod for Half Life 2.
First of all, I should mention that we'll be focusing on the basics for the first release: Establishing smooth, fun cooperative gameplay, and allowing level designers to start working on co-op maps. Features such as new monsters and weapons will be coming, but mostly in subsequent releases. Trying for too much at once would only delay things in the long run... and anyway, this way you'll have something to play while waiting for multi-user vehicles/etc.
More info over at svenco-op
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Half Life 2 wallpaper here :)
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