Day three of the Steam Sale reveals even better deals, with Deus Ex: Human Revolution for $24.99 and Dead Island for $19.99. Oldies include GTA IV and Knights of the Old Republic, both for $4.99 each. A highlight (for those that don't already own it) is the GTA franchise sale, which goes for just over $12.
For those of us with an iOS device, Gameloft and Electronic Arts are having pretty massive sales, with the latter of the companies offering their entire catalog for $1. I recommend Dead Space, which is a highly enjoyable addition to the Dead Space franchise. Notably missing from the Gameloft sale is their Saints Row/GTA series clone, Gangstar, and their Halo series clone, N.O.V.A.. On a side note, GTA: Chinatown Wars on iOS is now only $2.99, though it might be a price drop and not sale price.
I don't know about you, but I don't think I will be able to hold off my purchases for another few days.