I'm playing
Grand Theft Auto IV (PC)
The sequel to the carjack-fest of the century satisfies all your mob and hooker related fantasy, though it suffers from a few PC-porting related shortcomings.
I've Beaten
Half-Life 2: Episode Two (PC)
Continues the Half-Life 2 legend with a whole chapter of brand new content. Can't wait? Neither can we.
Halo 2 (PC)
The sequel to Xbox's biggest game is a multiplayer masterpiece, even if single-player suffers a bit.
BioShock (PC)
Dive beneath the ocean's surface for a dark masterpiece of gameplay design. Scaring you is just the first of many, many things BioShock does spectacularly right.
Half-Life 2: Episode One (PC)
Alyx and Dog return to add chapters to the ongoing saga of super-scientist Gordon Freeman.
Half-Life 2 (PC)
The first Half-Life is often called the finest first-person shooter ever made... this sequel is often called better than the first game.