Early id Software is one of my favorite companies to read about. Right up there with early Blizzard.
That era (the late 80s, early 90s) was game-studio nirvana. This was before all the corporate BS came in. You had a bunch of young, talented folks in an office park somewhere... turning out world-changing games. And that was it. "Here's this amazing game as shareware. Like it? Buy the rest." What a time to be alive.