If you are one of the many people who have put down their money and pre-ordered Left 4 Dead 2 via Steam, you also know that a demo for Valve's zombie co-op shooter game will be made available by Valve for those pre-orders on Tuesday. Now Valve has open the floodgates and allowed those folks to go ahead and pre-load the demo via Steam.

That means that when the pre-load is complete, it will only take a few minutes to unlock the demo on the release date. If for some reason you pre-ordered the game via an old fashioned brick and mortar retailer, Valve says the access codes to get the demo should also be available now. The demo will be made available to the general public on November 3.