Being extraordinarily cheap, the pride of my collection right now is Homeworld. Which I got last week. I'm also enjoying Heroes of Might and Magic III (!), trying to finally finish Crimson Skies, and get a decent start on Blood Omen 2. I just got done playing Red Alert 2, and should probably go out and buy Yuri's Revenge...
See? I'm quite, quite the behind-the-times PC gamer. Which is ironic, considering the GeForce FX5900 (last I checked, the definition of bleeding edge video cards - I get magazines telling me it isn't out yet, OK?) sitting in my new box.