It's not every day you see a Free Weekend event on Steam, and those pushed for Activision properties are even rarer sights to behold. Even still, the multiplayer for Call of Duty: Black Ops PC is totally free to play this weekend until Sunday at 1:00 pm PDT. Go make your ISP proud by downloading gigs of data.
In related news, the Escalation add-on is now available on PC, should you long for further multiplayer maps and zombies getting their asses kicked by various actors. It's worth noting Black Ops itself is temporarily on sale for $40.19; shame that's not the regular price.
Finally, double XP in multiplayer kicks off on Friday.