Play Half-Life with friends! Players fight computer-controlled monsters through the original Half-Life storyline or hundreds of available co-operative scenarios. Also includes a plethora of new weapons, enemies, visuals and gameplay systems. Customization features allow each map to use its own unique weapons and enemies.
AKA "Sam Co-Op", a decidedly US based weapons pack.
So Toadie and I did this thing for Sven, and I didn't post it on the actual Sven Co-Op forums.