I have always been a PC gamer. Ever since I was a little kid. I used to sit on my Dad's lap and watch him play Doom, Dune 2 (the RTS) and Lemmings.
When I grew up I began to play stuff like Starcraft, Diablo (pretty much all Blizzard titles since I had a Mac), Descent, Descent 2, SW :Episode 1 Podracer (lol loved that game!)
Now I play everything online on my PC, Left 4 Dead, World of Warcraft, Team Fortress 2, Battlefield 2, BF 2142, Call of Duty 2, Call of Duty 4, etc. And all the singleplayer games like Half Life (1 and 2 with all the Episodes), Crysis, Freelancer (which I loved, brought me back to my Descent days), Portal, etc.