Earlier this week, Valve instituted a new suite of cheat detection software in order to make online gameplay of Modern Warfare 2 more enjoyable. However, even measures undertaken with the best of intentions can go awry, and more than 12,000 people were banned by Steam even though they weren't cheating. Luckily Valve recognized when they messed up and have made it right with those effected.
In an email to those who were unecessarily banned, Gabe Newell explained that "the problem was that Steam would fail a signature check between the disk version of a DLL and a latent memory version." He elaborated on the problem, stating ""This was caused by a combination of conditions occurring while Steam was updating the disk image of a game. This wasn't a game-specific mistake."
As a gift to those who were banned, Valve has offered two free copies of Left For Dead 2, one for the user and one for a friend. Definite bonus points for doing the right thing and going the extra mile there Valve.