Co-op: Team Fortress 2 Mann vs. Machine

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Mann vs. Machine is a six player co-op in horde mode that was just added to Team Fortress 2. As Team Fortress 2 is free to play, and relatively old, the game should run on about any system. I want to see the head count and best times for everyone to get together to organize a few matches. While the game itself is free, if things go well there is an additional Mann Up mode that costs a dollar and guarantees rare items for anyone interested.

So, who's up for some co-op in TF2?