Saints Row IV just added Steam Workshop support. Already, you can download a guitar the shoots fire and some clothes that (sadly) don’t shoot fire. Why now, though? Because Saints Row IV wasn’t originally created with mods in mind, so devs worked in their spare time to make this possible. Very cool of them!
Red Faction: Guerrilla, the free-roam action game where you blow up buildings on Mars, just got a free "Steam Edition" update on PC. Among other things, the patch moves the game to Steamworks, adding leaderboards, achievements and trading cards, and completely removes Games for Windows Live. Full patch notes here.