BioShock, the genetically-enhanced shooter from 2K Games, is available for pre-purchase on Steam starting today. When you pre-purchase BioShock, you can pre-load the game to your desktop and start playing the moment the game is available.

BioShock will be available via Steam and at retail on August 21 in the U.S. and August 24 in Europe. For more information or to pre-purchase BioShock, click here.
Source BioShock, the genetically-enhanced shooter from 2K Games, is available for pre-purchase on Steam starting today. When you pre-purchase BioShock, you can pre-load the game to your desktop and start playing the moment the game is available.

BioShock will be available via Steam and at retail on August 21 in the U.S. and August 24 in Europe. For more information or to pre-purchase BioShock, click here.
Source