Hey so I know zombie stuff has kind of taken over the board right now.. What can I say- They are infectious! 
Anyway, new content to bridge the gap between L4D and L4D 2 is out now! It's called The Passing, and what?! Bill is MIA?? Serious? Well, I don't know about you, but I HAVE TO FIND BILL! I am gonna leave you with a link to a trailer. You can download this sucker for XBOX360 and of course PC. 

I think I am gonna go make a sandwich and find Bill. An army marches on it's stomach you know!