Today, KotOR2 is 75% off, X-COM is 33% off, Walking Dead is half price, Torchlight 2 is 25% off, Witcher 2 is 60% off, Fallout New Vegas with all DLC is 40% off, Dragon Age 1 is 50%, Legend of Grimrock at 50%, World of Goo is 75% and of course Basition is 50% off. These are all good things.
Also worth considering, To the Moon is a point and click adventure game that gets a little bit of love at 50% off, E.Y.E. Divine Cybermancy is supposed to be pretty decent (75% off), Hotline Miami I have heard good things about (25%).
Not on special but very good is FTL at $10.
Deadlight gets a bit of talking up at 25% off if you aren't sick of zombies/shooters yet.
Cave Story at 75% off will not hurt your wallet and is a Good Thing tm.
Payday: The Heist if there is 4 of you that want more Left 4 Dead style action and are sick of zombies is worth checking out.
Finally, I saw Endless Space is on there for like 50% off and Rat had been playing it a lot so I figured I should find out what it is; and hey there is a Rob review on the page which says
Been playing since the Alpha. My first comment was "This is an Alpha? Most games function this well at release." If you love 4x and spaceships and the possibility of a DS9 scenario where a giant evil empire is waiting for you on the other side of a wormhole, you'll dig Endless Space.
Soooooo yeah that is a decent enough recommendation for me to want to spread public praise.
If you like parkour and stabbing dudes in the face and for some reason haven't tried them yet Assassin's Creed 2 is very cheap.
Suffice to say, this is another sale that I have a lot of the stuff already, so eh.