Left4Dead411.com has a 10 minute video presentation made by Gabe Newell on the making of Left 4 Dead. This was originally only seen by members of the press at this year's E3, and the presentation is accompanied by an extended version of the E3 trailer from the upcoming multiplayer zombie game. Word is: "Gabe goes into detail on many aspects of the making of Left 4 Dead, including their goals in development, the what and why of the AI Director, all about the monsters including animation, physics and AI, and also all about the world including graphics and lighting technology."