To celebrate the memory of Johnny Gat, Volition is releasing GATV today for free. You get Gat and Aisha's oufits, .50 heavy machine gun, and a gatling gun that shoots Combat Knives. It's most likely free for PS3 and 360 as well, but the link to the Steam version is below. You must click "Install Game" in order to activate it, and the offer is only valid for today.
If you missed it, too bad.
Edited, Sep 18th 2013 3:48pm by Shaowstrike