Tons of gameplay videos & screens for your viewing pleasure:
"BioShock is a revolution in the shooter genre that will forever change the expectations for the FPS. Going beyond "run and gun corridors," "monster-closet AIs" and static worlds, BioShock creates a living, unique and unpredictable FPS experience. BioShock is the Shooter 2.0. After your plane crashes into icy uncharted waters, you discover a rusted bathysphere and descend into Rapture, a city hidden beneath the sea. Constructed as an idealistic society for a hand picked group of scientists, artists and industrialists, the idealism is no more. Now the city is littered with corpses, while wildly powerful guardians roam the corridors, mutated little girls scavenge the dead, and genetically modified citizens ambush you at every turn. Players must ultimately make meaningful choices and mature decisions, culminating in the grand question: do you exploit the innocent survivors of Rapture...or save them?"