"New deals everyday and hundreds of of deals all weekend".
Way too many games to list. A few standouts are Black Ops, Mass Effect 2, Portal 2 and Orcs Must Die.
Black Ops is 50% off, $44.99 (originally $89.99)
Orcs Must Die is 75% off $3.74 ($14.99) + DLC
All prices are in USD.
EDIT: I just sunk $95 into this sale. I didn't buy much of the big titles, but I took this chance to buy a lot of the indie stuff that have been heavily discounted at 75% off. I try to support the Indie Developers as much as I can.
Some purchase highlights are Mass Effect 1 + 2, Spectromancer (Designed by Garfield, who also designed Magic: the Gathering). Orcs Must Die + DLC, Dungeon Defenders + DLC, Fortex 2, ARES (For Megaman X fans), Commandos Collection (3 awesome games for less than 4 bucks?), NightSky (designers of Limbo), and a whole lot more. Awesome sale so far. I almost fear for my bank account for the other upcoming sales the next few days.
Which games did you guys purchase?
At the end of the sale period, they'll probably have all the big games on sale again, so wait till the last day to buy Portal 2. You might get a second chance.