Starting tomorrow, the six of you left out there with a Steam account who haven't played Modern Warfare 2
online in some form will get a free three-day pass to Murdertown (read: online multiplayer). Valve announced
today that, "beginning this Thursday, April 8," the online multiplayer section of the game will become free-to-play, presumably ending sometime on Sunday evening (no time is specified for start and end, but we've followed up with Valve for a solid schedule).
The announcement also notes that "There is no obligation to participate," though we imagine some totally boring
editor somewhere cut off the original ending, which read "unless you're into having fun. Then it's an obligation."