If you’ve played Left 4 Dead to death, Valve’s just made a pair of announcements that are sure to brighten your day.

First up, Left 4 Dead’s “Crash Course” DLC will finally walk among the living on September 29. It’s free, of course, and includes a new campaign, new survival maps, and a few other tweaks and balances.

Then, just in time to catch you on the rebound after you’ve kicked Crash Course to the curb, Valve’s dropping a Left 4 Dead 2 demo on October 27. Preorderers will apparently gain early access to the demo, though, and since you’re probably already going to buy the game anyway, you might as well.

As for what the demo actually contains, it’s anyone’s guess at this point. We’ll let you know as soon as Valve finally spills its guts. Our highly advanced torture techniques – known as “extreme nagging” in some circles -- break everyone eventually.