Over the past couple of weeks, Valve mistakenly banned over 12,000 Modern Warfare 2 players for cheating. As it turns out, the mass banz0r wasn't prompted by wallhacks or aimbots, but rather a failed signature check within the Valve Anti-Cheat component of Steamworks. Oops.
Valve has apologized for the snafu and reversed the erroneous bans. Company head Gabe Newell has also promised to give those affected up to two copies of Left 4 Dead 2: one for a friend and another for themselves if they don't already own the game. The freebie's a nice touch, even if Left 4 Dead 2 seems to be deeply discounted every week.