3D Realms. Wow. Practically every other game I played when I first got into video games was a 3D Realms title, so they're an intrinsic part of PC gaming as I know it. Surreal.
In sunnier news, I'm excited about the upcoming StarCraft 2 beta. Nick badgered me into playing StarCraft recently and it seems we've finally found a game he's better at than me. Hopefully SC2's changes throw him off enough for me to win at least one round.