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Check out this recent analysis of parts of the source: http://www.fabiensanglard.net/quakeSource/

I'm still pretty wet behind the ears, but looking through Quake source (and quake 2), was quite the experience. I though the code was beautiful, as well as impressed with how DRY everything seemed to be....oh, and variable naming, small things like that, really impressed me.

I second this. It's cool that the ideas behind some of the more simple things in the Quake game (such as the console, bindings, commands, etc.), are still being used as the back bone of other products (see: Valve). They are implemented very elegantly in the Q1 source.