FiringSquad: What other unique gameplay elements will Left 4 Dead have?

Michael Booth: As one of the first titles developed expressly as a co-operative experience, we've included several subtle gameplay elements unique to L4D that we've found to be very successful with players. These include the ability to revive a fellow survivor, helping someone hanging from a ledge, shooting off the tongue of a Smoker attempting to asphyxiate one of your friends, knocking a Hunter off of a friend who he has pinned to the ground and is shredding to bits, and sharing items with teammates. Other cooperative systems include an integrated voting system, and a context-sensitive vocalization system that enhances communications between Survivors.

FiringSquad: After the game is released on the PC will there be any additional content released for Left 4 Dead as has been the case for Counter-Strike Source?

Michael Booth: Absolutely. We already have ideas for additional missions, features, and content that we hope to ship in future releases/updates to Left 4 Dead. In addition, an L4D-specific update will be made to the Source SDK so members of the community can make their own missions, characters, and L4D MOD content.