As mentioned a few days ago Alien Storm has been released!
Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes.
Go grab it here
Looks good and available from Monday for free! Can’t argue with that for value.
Edit: 2 hours to go!
Two years ago Valve hired the talented team behind the popular top down co-op mod Alien Swarm. Since then they have been busy working on the Left 4 Dead Series, and now Portal 2. However, we never forgot about Alien Swarm and the team has spent a lot of time bringing the game to Source in between their contributions to the other Valve projects.
On Monday, July 19th Alien Swarm is going to be released for free via Steam
More details over at Steam