Ask the millions of people who bought Left 4 Dead on the PC and XBOX 360. We've been sorely missing some co-operative zombie head popping on PlayStation 3, so its with some jubilation that Housemarque's announced their upcoming PSN shooter Dead Nation will be getting the online co-op treatment.

Housemarque's revealed that multiplayer wasn't originally planned for the initial release of Dead Nation, but after a few 16 hours days (!!!) the team's managed to pull off the impossible.

The game's due on the PSN this Fall. There's a little more information on the PlayStation Blog.