Oh man, the Steam Sale has been ROUGH on me. I haven't bought any new games in like a year, so I went a little nuts. So far I've gotten:

Borderlands 2
Don't Starve
L.A. Noire
Ragnarok Online 2 (free, but grabbed it during the sale)
Saints Row: The Third
Defiance
Tomb Raider
Witcher 2

And that was just in the first 2 days. I'm sure that the damage isn't over yet...