Valve Interview Part 2 on Shacknews continues this conversation with Valve's Doug Lombardi on a variety of topics. Along the way Doug mentions their interest in branching out into things like MMOGs and family-friendly games, Steamworks, and Left 4 Dead. Doug admits to another delay for the multiplayer zombie game, which was expected in the summer (story), saying it is now planned for PC and Xbox 360 in November. Doug says he thinks there will be a playable demo (though this may be after the game's release) and that they are kicking around the idea of one of those free Steam weekend deals. He also explains the philosophy that leads to so many of their games suffering such delays:

So the game is pretty much playable all the way through right now. And as we've done with most of our games, we get to a point where, it's playable all the way through, there are some [minor] issues that we need to work on, and we try to add more time to the schedule to have as many people as possible play the game, to make sure that it's approachable to players of all skills. We want to make sure that all the game that we've built gets played, not just be like, "Okay, it's complete, let's ship it."