For the sixth and final day of their "Give & Get" sale, Steam has slashed the price of Star Wars: Knights of the Old Republic to $2.50 and an 8-pack of the RPG-lite platformer title Trine to $19.99 ($2.50 each).
I know it suffered from consolitis, but KotOR is still one of my all-time favorite games. I'd happily play it any day of the week before Mass Effect or Mass Effect 2.