via Steam RSS News Feed by valve on 4/29/09
Beginning Friday at 12:01 am GMT, the PC version of Left 4 Dead will be available for a free 24-hour trial via Steam. The 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 to play with no obligation to purchase.