To celebrate its one year birthday, the Humble Store is giving away free copies of the hit fps, Metro: 2033. This offer begins today, November 7th, and ends tomorrow at 10:00 a.m. PST. This is personally one of my favorite games to come out in the past few years, and am glad I now have the chance to play through it again on a high end gaming PC. Although there are unlimited keys being given away, the deal ends quickly, so get it while you can at their website!