There's not many games included in GOG.com's weekend promotion but boy are they good ones. There's 50% off EA god games, including titles like Dungeon Keeper, Populous, Sim City 2000, and Sid Meier's Alpha Centauri. There's some real classics there, so I'm tempted to pick up the whole bundle for $17.94.
Origin have thankfully started highlighting special offers and right now they've got 50% off a lot of games and DLC, including Dead Space and Dead Space 2, Medal of Honor, Mirror's Edge, and Bulletstorm. Saints Row is the franchise on offer over at GamersGate; there's 70% off Saints Row 2 and 50% off Saints Row 3 along with the game's DLC.
If you hadn't already noticed, Steam has a big weekend sale on Ubisoft titles. Right now, there's 50% off From Dust, Shoot Many Robots, and Rayman Origins. There's 33% off Ubisoft's entire catalog on Steam, but I'd recommend holding off until you see the Ubisoft game you want featured on Saturday or Sunday. As always, find a great weekend PC deal and post it below, it's much appreciated.