John Carmack, lead programmer and technical director of ID software (game like Doom, Quake, Wolfenstein) giving keynote presentation on QuakeCon each year. It is usually very hardcore speech about the technology, advances in computer graphics and so forth. This year it is little bit more accessible for most people with interest in gaming technology and business and if you have two spare hours I recommend to take a look on this video.

In this keynote he talks about how they was acquired, iPhone development, Rage and its technology for level designers, growth of ID software (from 15 people to about 100) and also put some random bits on things they like: rockets, his experience driving Tesla electric car and so. Video is located here.