The Potato Sack is a bundle of games, which Valve is so good at doing through Steam, that costs about 40 dollars and includes 13 "hit indie games" for you to get your hands on. Before this announcement there were rumors that Portal 2 had some things scattered around inside of the games in this bundle but nothing of this magnitude. The bundle includes indie gems such as Super Meat Boy, Amnesia and Killing Floor. These are not bad games but knowing Valve's and Portal's rabid fan base, This sale is about to shoot profits for the company through the roof. I anticipate sales of this bundle to shoot up and then if Portal 2 launches early then that will sell like crazy as well.
Well played Valve, well played.