Got big weekend plans? Oh, yeah? Cancel them. Starting on Friday (that’s tomorrow, folks) at 12:01AM GMT — which actually ends up being 8:00PM EDT this evening — the PC version of the heralded Left 4 Dead will be available for a free 24-hour trial via Steam. That free trial will include access to the recently released Survival Pack DLC, which introduces a new multiplayer game mode and two additional Versus campaigns. Those who wish to give L4D and the Survival Pack a try may now pre-load everything needed