Free weekend of Left 4 Dead 2 for Silver Live members

Left 4 Dead 2 is going free on the Xbox 360 next weekend. Starting at 5pm on the 15th until 5 on the 18th, Valve’. While co-op and multiplayer action is usually reserved for Xbox Live Gold members, next weekend anyone with a copy of the game and an internet connection will be able to join the  zombie shooting fun.