Doomworld interviews John Carmack talking to id's lead programmer about the days way back when Doom was being created. Good stuff, including the first revelation I've ever seen of where Doom got its name:

Carmack: There is a scene in "The Color of Money" where Tom Cruse shows up at a pool hall with a custom pool cue in a case. "What do you have in there?" asks someone. "Doom." replied Cruse with a cocky grin. That, and the resulting carnage, was how I viewed us springing the game on the industry.