Stardock's digital distribution platform, Impulse, is having its weekend sale, knocking 50% off Trine, 1C Racing Mega Pack (if you do not want the entire pack, each of the 5 games has dropped from $9.99 to $6.99), Gratuitous Space Battles, and Alganon, while also dropping the price on Light of Altair, and Armada 2526.